"Throw away the crutch of knowledge and use the Knowing..." Thomas Elpel.

The Power of Plant Oils is a forum for learning about the therapeutic use of essential oils.
This 13 module course is a means of acquiring the knowledge and experience so you can KNOW the properties
and uses of the plants and their oils.


Please read this blog from the bottom up and check out previous posts to the right under Blog Archives.

Thursday, December 9, 2010

GIVE THE GIFT OF A HOMEMADE SALT SCRUB

Why use a body scrub? Daily oiling of the body helps to support beautiful skin, and gives it great nourishment. It feeds our body from the outside in, increases circulation, reduces the signs of aging and helps our body to be more "lubricated." Like oiling the tin man -- the more you add oil, the better your joints, muscles, and tendons respond to staying flexible. Nourishing scrubs also assist in tonifying the nervous system (helping to calm you down and focus the mind/body) and the gentle exfoliating feels so good!


Nourishing & Invigorating Body Scrub
 
What you'll need:
-  Any size clean jar, preferably glass. 
-  Fine sea salt
-  Organic almond oil or sunflower seed oil
-  Essential oils of grapefruit, rose geranium, and rosemary (Tri-Doshic blend)-  this blend of oils will generally be good for all constitutions.

Directions:
 
-  Fill jar halfway with sea salt
-  Slowly fill jar with your oil; it takes a little time for the salt to absorb the oil. Poke and stir the oil into the salt with a wooden spoon or chopstick. Once the oil is nicely absorbed into the salt, add a little more salt, and a little more oil (small amounts at a time) until your jar is full. You want a small layer of oil floating above the salt.
-  Add total of 12 drops essential oil per ounce of scrub.  
-  Wipe down the jar, label it with a happy name such as, "I Am Radiant Scrub" and VOILA! 

Use daily or as desired to nourish your skin. Use gentle flowing strokes towards the heart as you scrub. Be careful getting in and out of your bathing environment as it will get a little slippery with the oil.

Optional nourishing oils: Sesame, Gotu Kola infused oil,
St. John's Wort infused oil, Calendula infused oil. (If using infused oils;  you can use 10% infused oil added to your primary oil).

Optional Essential Oil Favorites: You should like how this smells!  Find the aromas that make your heart and mind sing. Some favorites are: Vetiver, Red Mandarin, Ginger or Roman Chamomile, Ylang Ylang, and Grapefruit. Use caution with skin irritating oils such as Peppermint, Clove, Cinnamon and Thyme.

From Yoga Journal contribution writer, Stephanie Bernstein, the Founder and CEO of To-Go Ware. 
 

Tuesday, December 7, 2010

ANTIVIRAL PROPERTIES OF ESSENTIAL OILS

BY Arianna Staruch, ND, ACHS Academic Dean

Long before the development of antiviral medications, natural support options have been used to address influenza and the common cold. Essential oils are know to have antiviral activity, specifically the monoterpene constituents, such as alpha-terpinene, gamma-terpinene, alpha-pinene, p-cymene, terpinen-4-ol, alpha-terpineol, thymol, citral, and 1,8-cineole.  A number of essential oils, including eucalyptus (Eucalyptus globulus), lemon balm (Melissa officinalis), manuka (Leptospermum scoparium), peppermint (Mentha piperita), tea tree (Melaleuca alternifolia), and thyme (Thymus vulgaris) have been found to have antiviral activity against the herpes simplex virus type 1 (HSV-1) in vitro.123 

In addition, some essential oils have been tested for specific antiviral activity against the influenza virus. The essential oil of Houttuynia cordata (an Asian plant related to lizard’s tail) was found to have direct inhibitory activity against the influenza virus in vitro by interfering with the function of the viral envelope, which help viruses to enter host cells.4 However, there have not been any clinical trials yet with human subjects to see if these in vitro or animal studies will translate into effective treatment options as compared with antiviral medications.

One of the common occurrences with influenza is fever. Fever is a protective mechanism of the body to increase the activity of the immune cells. However, sometimes fever can be debilitating or even life threatening. Fevers of more than 103° should be addressed quickly with your healthcare provider. Radix bupleuri (bupleurum root) is widely used in traditional Chinese medicine to address fever, pain, and inflammation associated with influenza or the common cold. A recent study looked at preparing a nasal spray from the essential oil of this herb and tested it in animals for effectiveness. It did show promise as a fever reducer.5 However, many essential oils can be irritating to mucus membranes and should not be used undiluted or without first doing a skin patch test.

So how can you use essential oil in your everyday life to help reduce to risk of viral infection? Essential oils can be used in the home as antiviral cleaning products. A diffuser with any of the oils listed above, such as eucalyptus, lemon balm, or peppermint, may reduce the airborne viruses in a room. In addition, essential oils may be added to hand creams to help reduce the spread of viruses by contact. Of course, these should be used in addition to the common sense CDC recommendations to wash your hands frequently, cover your mouth and nose with your arm when you sneeze, and to stay home if you are sick. (You should see your primary care provider for a proper diagnosis if you think you may have the seasonal flu or the H1N1 flu, and follow their recommendations.) This fall may be a challenging time because there is the potential for many people to be sick with the flu at the same time, but we can use natural support options, such as essential oils, to keep us healthy.

References
1. Astani, A., Reichling, J., and Schnitzler, P. Comparative study on the antiviral activity of selected monoterpenes derived from essential oils. Phytother Res. 2009 Aug 3.
2. Reichling, J., Koch, C., Stahl-Biskup, E., Sojka, C., and Schnitzler, P.
Virucidal activity of a beta-triketone-rich essential oil of Leptospermum scoparium (manuka oil) against HSV-1 and HSV-2 in cell culture. Planta Med. 2005 Dec;71(12):1123-7.
3. Schnitzler, P., Schuhmacher, A., Astani, A., and Reichling, J. Melissa officinalis oil affects infectivity of enveloped herpesviruses. Phytomedicine. 2008 Sep;15(9):734-40.
4. Hayashi, K., Kamiya, M., Hayashi, T. Virucidal effects of the steam distillate from Houttuynia cordata and its components on HSV-1, influenza virus, and HIV. Planta Med. 1995 Jun;61(3):237-41.
5. Xie, Y., Lu, W., Cao, S., Jiang, X., Yin, M., and Tang, W. Preparation of bupleurum nasal spray and evaluation on its safety and efficacy. Chem Pharm Bull (Tokyo). 2006 Jan;54(1):48-53.

Tuesday, November 30, 2010

FUN FACTS ABOUT THE SKIN


1. The skin (integumentary system) is the largest organ of the body. (ACHS)

2. The epidermis (top layer of the skin) is thinnest on the eyelids and thickest on the palms and soles of the feet (Wikipedia)

3.The entire epidermis  is replaced by new cell growth over a period of about 48 days. (Lizuka, Hajime (1994) “Epidermal Turnover Time”. Journal of Dermatological Science 8 [3]: 215-218.)

4. We have approximately 1500 sensory receptors in 1 square inch of skin; there are more in the mouth, tongue, and hand than on the back or the calf.  (ACHS)

5. The pH of the outer layer of the skin is usually mildly acidic (5.5) to protect against bacterial, viral, and fungal infection. (ACHS)
           
6. 50% of a person’s adipose tissue (fat cells) is found subcutaneously. (ACHS)

7. Vitamin C and copper are important for collagen formation. (ACHS)

8. Hair covers the entire body except the palms, soles, lips, and genitals. (ACHS)

9. The average person has around 5 million hairs on their body, 100,000 of which are on the scalp. (ACHS)

10. When the hair is wet, it can stretch to 1 ½ times its normal length. (ACHS)

11. Nails are hardened keratin (protein) and are created by thickening of the epidermis welding together. (ACHS)

12. Nails lose moisture 100 times faster than the skin. (ACHS)

13. The nails are a window into the body’s health; changes in look, shape, or color may indicate disease. (ACHS)

14. Sweat glands are found all over the body but especially in the palms and the soles of the feet. (ACHS)

15. Sweating eliminates about 1/3 of the body’s waste each day. (ACHS)

16. Harmful ingested substances like aspirin can show up in the skin and hair hours after they are excreted (it can take up to 20 days to be fully eliminated).  (ACHS)

17. Diaper rash and thrush (white patches on the cheeks of the mouth) are caused by yeast (Candidiasis). (WebMD – skin problems)

18. Staph infections of the skin can be contracted by touching athletic equipment, door handles, shopping carts, razors, and towels, and are frequently acquired in gyms and college dorms. (WebMD – skin problems)

19. Roughly 10% of the population suffers from athlete’s foot or nail fungus (Jones, Larissa. P. 289)

20. Americans spend an average of 18 billion dollars annually on skin-related products, including hair care (Cooksley. p.160)

21. Wrinkles are the skin folding in on itself. The collagen becomes criss-crossed and hard, greatly diminishing its ability to retain moisture. (Cooksley, p.164)

22. More than 7,000 Americans every year are “afflicted” with skin cancer. (Cooksley, p. 164.).

23. People with dark skin and hair will generally retain a more youthful appearance than others who have fair skin, freckles, and light colored hair (because their skin is oilier). (Cooksley, p.164.)

24. 90% of the symptoms of aging skin are caused by exposure to ultraviolet light, and most of these effects occur before age 20. (http://dermatology.about.com/cs/beauty/a/wrinklecause.htm)

25. The number of epidermal cells decreases by 10% per decade and they divide more slowly as we age, making the skin less able to repair itself quickly. (same source as above)

26. Hair is the only body structure that is completely renewable without scarring. (The Biology of Hair)   
      
27. Hair grows about six inches per year. (The Biology of Hair)

Resources: 
American College of Healthcare Sciences (ACHS). Aroma 201 manual. © 2007.
Cooksley, Valerie. Aromatherapy – A Lifetime Guide to Healing With Essential Oils. Prentice-Hall. New Jersey. USA. © 1996.
Jones, Larissa. “Aromatherapy for Body, Mind, and Spirit”. Evergreen Aromatherapy. Salt Lake City, Utah. © Evergreen Aromatherapy, 2001.
Lizuka, Hajime (1994) “Epidermal Turnover Time”. Journal of Dermatological Science 8 (3): 215-218.
The Biology of Hair.  www.dermatology.about.com. Accessed 11/28/2010.
What Causes Wrinkles? http://dermatology.about.com/cs/beauty/a/wrinklecause.htm. Accessed 11/27/2010.
WebMD www.webMD.com/skin-problems. Accessed 11/27/2010.

Saturday, November 27, 2010

WRINKLES AND AGING

This month, we study the anatomy and physiology of the skin. Here is some great information about how wrinkles are created and some ideas for caring for your skin. Read all the way through to discover essential oils that are especially helpful for mature skin:

What Causes Wrinkles and Aging?

Chronological Aging and Wrinkles

As a person ages the epidermal cells become thinner and less sticky. The thinner cells make the skin look noticeably thinner. The decreased stickiness of the cells decreases the effectiveness of the barrier function allowing moisture to be released instead of being kept in the skin. This causes dryness. The number of epidermal cells decreases by 10% per decade and they divide more slowly as we age making the skin less able to repair itself quickly.

The effects of aging on the dermal layer are significant. Not only does the dermal layer thin, but also less collagen is produced, and the elastin fibers that provide elasticity wear out. These changes in the scaffolding of the skin cause the skin to wrinkle and sag. Also, sebaceous glands get bigger but produce less sebum, and the number of sweat glands decreases. Both of these changes lead to skin dryness.

The rete-ridges of the dermal-epidermal junction flatten out, making the skin more fragile and making it easier for the skin to shear. This process also decreases the amount of nutrients available to the epidermis by decreasing the surface area in contact with the dermis, also interfering with the skin's normal repair process.

In the subcutaneous layer the fat cells get smaller with age. This leads to more noticeable wrinkles and sagging, as the fat cells cannot "fill in" the damage from the other layers.

Aging Effects of the Sun and Wrinkles

Exposure to ultraviolet light, UVA or UVB, from sunlight accounts for 90% of the symptoms of premature skin aging. Most of the photoaging effects occur by age 20. The amount of damage to the skin caused by the sun is determined by the total lifetime amount of radiation exposure and the person's pigment protection.

Sunlight Effects on the Epidermis

Changes in the epidermis caused by the sun include thinning of the epidermis and the growth of skin lesions such as actinic keratoses, basal cell carcinomas, and squamous cell carcinomas.

Sunlight Effects on the Dermis

In the dermis, sun effects cause collagen to break down at a higher rate than with just chronologic aging. Sunlight damages collagen fibers and causes the accumulation of abnormal elastin. When this sun-induced elastin accumulates, enzymes called metalloproteinases are produced in large quantities. Normally, metalloproteinases remodel sun-injured skin by manufacturing and reforming collagen. However, this process does not always work well and some of the metalloproteinases actually break down collagen. This results in the formation of disorganized collagen fibers known as solar scars. When the skin repeats this imperfect rebuilding process over and over wrinkles develop.

Free Radicals and Wrinkles

Free radicals are unstable oxygen molecules that have only one electron instead of two. Because electrons are found in pairs the molecule must scavenge other molecules for another electron. When the second molecule looses its electron to the first molecule, it must then find another electron repeating the process. This process can damage cell function and alter genetic material. Free radical damage causes wrinkles by activating the metalloproteinases that break down collagen. There are several factors that start this cascading process including exposure to even small amounts of UV radiation in sunlight, smoking, and exposure to air pollution.

Hormone Effects and Wrinkles

It is likely that there are skin changes as a result of the hormonal effects of menopause or decreased estrogen production. However, studies in humans have not documented which skin changes are specific to decreased estrogen and which skin changes are a result of sun exposure or just normal chronological aging. In animal experiments lack of estrogen can cause a decrease in collagen levels of 2% per year and a decrease in skin thickness of 1% per year.

Muscle Use and Wrinkles

Habitual facial expressions cause the skin to wrinkle as it looses elasticity. Frown lines between the eyebrows and crows feet radiating from the corners of the eyes develop as the tiny muscles in those areas permanently contract.

Gravity and Wrinkles

The effects of gravity make the loosening of the skin more apparent as skin sags more. This causes jowls and drooping eyelids. 
The sun gives off ultraviolet (UV) radiation that we divide into categories based on the wavelength. UVC radiation is absorbed by the atmosphere and does not cause skin damage. UVB radiation affects the outer layer of skin, the epidermis, and is the primary agent responsible for sunburns. UVB does not penetrate glass, and the intensity of UVB radiation depends on the time of day and the season. UVA radiation penetrates deeper into the skin and works more efficiently. The intensity of UVA radiation is more constant than UVB without the variations during the day and throughout the year. UVA is also not filtered by glass.

UV Radiation and Wrinkles

Both UVA and UVB radiation cause wrinkles by breaking down collagen, creating free radicals, and inhibiting the natural repair mechanisms of the skin. A popular classification system of sun-sensitivity is the Skin Phototype (SPT) classification. People with skin types I and II are at the highest risk for photoaging effects including wrinkles and skin cancer. The proper use of sunscreen to block both UVA and UVB radiation is an important weapon in the battle against wrinkles.


*****************************

Essential oils for mature skin: geranium (Pelargonium graveolens) supports in balancing and rejuvenating dry skin conditions such as wrinkled and mature skin; frankincense and myrrh are both gentle and effective in replenishing moisture. According to Young Living Essential Oils, frankincense repairs DNA damage, and sandalwood prevents further DNA strand breakage. Frankincense is a major ingredient in their day-activator moisturizer, and sandalwood is the main ingredient in the night rejuvenator cream. Boswellia (frankincense) and NingXia wolfberry assist in wrinkle prevention and repair in the Boswellia wrinkle cream.

Rose  (the Queen of Flowers) and Jasmine (the King of Flowers) have been renowned since ancient times for possessing anti-aging properties.

Jojoba oil, actually a wax, is similar to the sebum normally produced by the skin and is helpful in restoring moisture to mature and/or dry skin. Use as a base oil for essential oils. Other base oils for the skin are: Rose hip seed oil (Rosa Mosqueta, or Rosa rubiginosa), hazelnut, macadamia nut, kikui nut, carrot seed and wheatgerm oil. Borage and Evening Primrose are also excellent and help to balance the hormone levels in the skin.


Be gentle when applying oils to the face - never pull, rub, or over-manipulate the skin!

Friday, November 12, 2010

FUN FACTS ABOUT THE SENSE OF SMELL:

    • Humans have the largest ratio of brain weight to body weight of any creature on earth15
    • Scientists have discovered that approximately 1% of our genes are devoted to sensing aromas1
    • Humans can smell up to 16 million odors16
    • Our sense of smell is 10,000 times more sensitive than our sense of taste1
    • The sense of smell can be sharpened and intensified with use (and training)1
    • Smoking adversely affects the sense of smell; it can up to a full year for it to return1
    • No two people smell the same odor the same way; a rose may be sweeter to some than others2
    • Inhalation is the fastest indirect route for the body to absorb volatile substances – research says it takes 1-5 minutes1
    • The nose smells directionally2
    • The sense of smell is least acute in the morning; our ability to perceive odors increases throughout the day2
    • We all have our own unique odor (smell fingerprint) and can be recognized by that odor2 
    • Women have a more acute sense of smell than men at all ages.6
    •  Women have an increased sense of smell at ovulation and during pregnancy – estradiol11
    • Study at Vanderbilt University in Nashville Tennesee showed that 90% of women tested can identify their baby’s smell after only ten minutes to one hour of exposure after birth 8*
    • The odor produced by the fetus changes the pregnant mother’s urine and even alters the odor of the mother herself (Monell Chemical Senses Center study 1995)
    • The fetus samples the outside world through the amniotic fluid1; this influences postnatal preferences13
    • Infants recognize their mothers very quickly by smell (bonding)1
    • Body odor may be linked to sexual orientation**
    • Our ability to smell is at its peak at about age 8 and declines as early as age 1512
    • As we get older, our sense of smell declines; we also lose our ability to discriminate between smells
    • Smell is unique among the senses in its privileged access to the subconscious
    • Your sense of smell doesn’t sleep
    • Sperm may smell their way to the egg14
    • Research has shown that your body position can influence your ability to smell (lie down and you become less sensitive)9
    • Dogs and horses can smell fear in humans; sharks can smell 1 tsp of blood in the equivalent of 3 swimming pools of water1
    • Human males born without olfactory bulbs and therefore have no sense of smell have been reported to suffer from hypogonadism (testicular and penile atrophy)7
    • The scent of grapefruit can cause men to perceive women to an average of six years younger than they really are2
    • A combination of floral and spice scents can cause men to see them as an average of 4.1 pounds lighter in weight.2
    • A combination of lavender and pumpkin increased arousal by 40%, as measured by blood flow.2
    • The smell of peppermint can increase athletic performance.2***
    • Many mental illness are characterized by a decrease in smell can be one of the earliest indications of approaching Alzheimer’s Disease 7****
    • Astronauts tend to lose their sense of smell (thought to be because of nasal congestion as a result of increased capillary pressure)9
    • Viagra may impair the ability to smell5
    • Traumatic head injury can cause an irreversible loss of smell
    • Low vitamin A levels may correlate to a loss of smell (the greater the pigmentation of the olfactory epithelium, the more sensitive it is to smell)
    • Albino animals lack a sense of smell16
    • Zinc has been used successfully to treat some smell and taste disorders.12
    • Smell can be used to decrease seizures in epilepsy (One possible explanation is that because olfactory centers are next to regions where seizures begin in temporal lobe epilepsy, activity generated in these areas by the presentation of a smell prevents the spread of the synchronous activity from the epileptic focus.)
    • Researchers found that what a scent is called can have an affect on whether or not people like it. For example, study participants were told that an odor was either cheddar cheese or body odor.

      (from: Shutterstock 3/06/09)
      *Humans can differentiate blood-relatives (mothers and children, but not husbands and wives) through olfaction. Mothers can identify their biological children but not their stepchildren through body odor, and preadolescent children can pick out their full siblings but not half siblings the same way (the theory is that this has a bearing on avoiding incest)17 

      **Researchers found that gay men and women had body odor preferences that were different from straight men and women. After evaluating 24 samples of underarm odor, gay men preferred odors from gay men and straight women. Odors from gay men were the least preferred by straight men and women and by lesbian women.10

      ***Peppermint has an affect on the reticular formation (in the brainstem), where arousal and sleep are modulated. Bryan Raudenbush, professor of psychology at Wheeling Jesuit University in Wheeling, West Virginia discovered with his research that the smell of peppermint can increase athletic performance.  Peppermint odor also helps people work out longer and harder. Additionally, Raudenbush found that peppermint or cinnamon scents make for more alert, less frustrated drivers.2

      ****“Schizophrenics, depressives, migraine sufferers and very low weight anorexics often experience olfactory deficits or dysfunctions.” One group of researchers even suggested smell-tests should be part of the diagnostic process for psychiatric disorders because many of them are so closely linked to olfactory deficits.11 Alzheimers patients gradually lose the ability to recognize loved ones, and eventually their possessions, their houses and location of rooms – “all permeated with the subtle pheromonal secretions of the occupants”7

      1American College of Health Sciences. Aroma 201 Manual.
      2Dembling, Sophia. “Dr. Smell”. Dallas Morning News.
      3“Fun Facts with Professor Nosetradamus”. The Sense of Smell Institute. The Fragrance Foundation, Research and Education Division. www.senseofsmell.org.  Accessed 10/19/2010.
      4Gordon, C.B. Practical Approach to the Loss of Smell American Family Physician 26 (3) 191-193. 1982.
      5Gudziol, V., Muck-Weymann, M., Seizinger, O., Rauh, R., Siffert, W. and Hummel, T (2007) Sildenafil Affects Olfactory Function. Journal of Urology 177(1), 258-61. 
      6Howard Hughes Medical Institute. http://www.hhmi.org/senses/d130.html Hughes et al. Climacteric. 2002 Jun;5(2):140-50
      7Joseph, Rawn, PhD. Olfactory Limbic System. Reprinted from Neuropsychiatry, Neuropsychology, Clinical Neuroscience. 3rd Edition. Academic Press. New York. 2000. http://brainmind.com/OlfactoryLimbicSystem.html.
      8Kaitz M, Good A, Rokem AM, Eidelman AI. Mothers learn to recognise the smell of their own infant within 2 days. Dev Psychobiol. 1987 Nov;20(6):587-91.
      9Lundstrom et al., (2006) "Sit up and smell the roses better: olfactory sensitivity to phenyl ethyl alcohol is dependent on body position". Chemical Senses, e-print ahead of publication,         doi:10.1093/chemse/bjj025.
      10Martins Y, Preti G, Crabtree CR, Runyan T, Vainius AA, Wysocki CJ.Preference for human body odors is influenced by gender and sexual orientation.Psychol Sci. 2005 Sep;16(9):694-701.
      11Macalester College’s Behavioral Neuroscience Class. www.macalester.edu/psychology/whathap/UBNRP/smell/memory.htm. Accessed 10/19/2010)
      12Monell Center (The world’s only independent, non-profit scientific institute dedicated to basic research on taste and smell) www.monell.org
      13Schaal, B, Marlier, L, Soussignan, R. Human Fetuses Learn Odors From Their Mother’s Diet. Chemical Senses. 25 729-737. 2000.
      14Spehr, M., Gisselmann, G., Poplawski, A., Riffel, J.A., Wetzel, C.H., Zimmer, R.K. and Hatt, H.  Identifiaction of a testicular odorant receptor mediating human sperm chemotaxis". Science  2003 Mar 28; 299 (5615), 2054-8
      15Social Research Center. “The Smell Report”. http://www.sirc.org/publik/smell_emotion.html. Accessed 10/22/2010.
      16Stoddard and Whitfield. Hearing, Taste, and Smell. Pathways of Perception. Torstar Books, Inc. New  York, NY. (Quoted in “Olfaction and Memory”.
      17Wikipedia http://en.wikipedia.org/wiki/Olfaction. Accessed 10/22/2010.

      Saturday, October 23, 2010

      Wild Lavender

      The following is re-posted from Kurt Schnaubelt's blog (see link below, and to the right)

      Wild Lavender

      August 15th, 2010

      For the amount of Wild Lavender that is offered on the internet, it is amazing how few pictures there are. Here is one from the Montaigne de Lure, where much of the real wild Lavender comes from. Wild Lavender generally grows in altitudes higher than those of the cultivated population Lavender. Wild Lavender or “Lavande suavage” is available from the OSA site in a 2 for 1 special for a limited time only, as long as the allocated supplies last.


      Wednesday, October 20, 2010

      Magic Relief Formula

      Combine the following in the exact order in an amber-colored glass jar:

      1 oz. V6 mixing oil
      8 drops Spruce
      8 drops Sandalwood
      7 drops Fir
      5 drops Hyssop
      4 drops Lemongrass
      5 drops Helichrysum
      4 drops Birch (or Wintergreen)
      2 drops German (blue) Chamomile
      1 drop Blue Tansy

      The blend was created by D. Gary Young and is indicated for bone, joint discomfort and tissue regeneration.