Tea tree, Lavender, Hormones

[Guest guest]

Hello,

The Tea Tree Lavender issue was addressed by Robert Tisserand in a newsletter

from the Alliance of International Aromatherapists February 2009

Vol. 5 - No. 2

 

Mainstream media jumped on this story a few years ago, attempting to pin the

issue of breast growth in boys on lavender and tea tree oil that was one of many

suspiscious ingrediants in hair care products.

 

Just another wonderful benefit of becoming a member of this professional

organization. http://www.alliance-aromatherapists.org/

Jodi Baglien

 

 

 

Scientific Information Shared

by Robert Tisserand

 

Neither Lavender oil nor Tea Tree oil can be Linked to Breast Growth in Young

Boys

 

Introduction

 

In 2007, a correlation was alleged between commercial products containing

lavender and tea tree oils and breast growth in young boys. Three cases were

seen in boys aged 4-7, who had all been using such products. In each case, the

breast growth reduced to normal parameters within several months of ceasing to

use the products. Subsequent laboratory testing showed that both essential oils

had estrogen-like properties (Henley et al 2007).

 

In the report, no information was given about any of the product ingredients,

and there is scant information on product use. No analysis was carried out to

confirm or rule out the presence of essential oil constituents.

 

Case one

In the first case, " The patient's mother reported applying a " healing balm "

containing lavender oil to his skin starting shortly before the initial

presentation. " No further details of the product or its use are given, but a

healing balm sounds like something that might only be applied to a small area of

skin. If so, then it is unlikely that any ingredient could have entered the

boy's blood in sufficient concentration to cause gynecomastia within a short

time period.

 

Case two

In the second case, a styling hair gel was applied to the hair and scalp every

morning, along with regular use of a shampoo. Both tea tree oil and lavender oil

are cited on the ingredient list of both products.

 

In a subsequent website report, it is claimed that the two hair products used in

this case were manufactured by Paul Mitchell®, and that these were analyzed by a

competitor. The shampoo was said to contain " very low concentrations " of tea

tree oil, and the content in the hair gel was " virtually undetectable " . Lavender

oil concentration was not checked (Neustaedter 2007).

 

Dermal absorption of fragrance from shampoo application has been estimated to be

80 times less than that from body lotion (Cadby et al 2002) and tea tree oil

constituents are poorly absorbed by human skin. In one study, only 3% of the

essential oil volume, applied as a 20% concentration in ethanol, was absorbed in

a 24 hour period (Cross and Roberts 2006). If the website report is reliable,

considering that shampoo is a wash-off product, and that there was only a

negligible amount of tea tree oil in the hair gel, tea tree oil can be ruled out

as a possible cause of this boy's gynecomastia.However, liberal use of a hair

gel rich in lavender oil could result in moderate dermal absorption of lavender

oil constituents (Cal 2006).

 

Case three

The third case involved " lavender-scented soap, and intermittent use of

lavender-scented commercial skin lotions " . This sounds as if there may not be

very much natural lavender oil present. Since soap is a wash-off product, and

use of the skin lotions is described as " intermittent " , whether any meaningful

absorption of lavender oil constituents took place at all seems doubtful.

 

As dermal absorption of soap fragrance is some 266 times less than that from

body lotion, it is virtually impossible that the fragrance in a soap could be

absorbed in sufficient quantity to cause any physiological effect (Cadby et al

2002).

 

Of great interest is the statement that, in this third case, a fraternal twin

used the same skin lotions, but not the soap, and did not develop gynecomastia.

It would be reasonable to assume that, since the soap could not be responsible

for the effect, and since the twin used the lotions without any problem, the

gynecomastia in this third case must have been due to some cause other than

essential oils.

 

The In Vitro testing

The in vitro evidence shows weak but definite endocrine disrupting effects for

both lavender and tea tree oils.

 

The second case was the only one in which tea tree oil was involved. Tea tree

oil was tested because it was deemed to be " chemically similar " to lavender oil.

However, apart from the fact that both are essential oils, they have very little

in common chemically.

 

The composition of the essential oils tested is not given, nor is any other

information about them, apart from the supplier. Since they do not appear to be

organically grown, biocide content is a possibility.

 

 

Discussion

 

It is unusual in such reports not to name the products suspected as being

responsible for the effects in question. In the circumstances, it is also

curious that the labeled ingredients were not cited. It is even more surprising

that no attempt was made to ascertain, retrospectively, whether any constituents

of lavender or tea tree oil were detectable, and if so at what concentrations.

If the products are not named, no one else can test them either.

 

Subsequent research has confirmed that tea tree oil does show weak in vitro

estrogenic action in MCF-7 cells (Nielsen 2008). However, none of the tea tree

oil constituents that penetrate human skin (terpinen-4-ol, a-terpineol,

1,8-cineole) act as estrogens, either singly or in combination, in fact

a-terpineol is anti-estrogenic (Cross et al 2008, Nielsen 2008, Reichling et al

2006). Tea tree oil is not a skin penetration enhancer, and in one study reduced

the quantity of other substances (benzoic acid and methiocarb) crossing the

dermal barrier (Nielsen and Nielsen 2006).

 

The two main lavender oil constituents, linalool and linalyl acetate, are

absorbed by human skin (Jäger et al 1992). However, transcutaneous absorption

from fragrances takes some time. The amount that could find its way into the

blood from a wash-off product such as a shampoo or soap is negligible, because

the time of skin contact is so short. Skin absorption from tea tree oil and

lavender oil constituents is measured in hours rather than minutes, and in some

instances even leave-on products result in minimal dermal penetration (Cal 2006,

Reichling 2006).

 

No attempt was made to identify the constituent(s) responsible for the in vitro

effect, but it is reasonable to expect that any hormonal action in an essential

oil would be due to one or two constituents, or even contaminants. It is

noteworthy that, while in vitro hormonal effects from essential oil constituents

have been previously reported, these are generally very weak, and have been

estimated as being at least 10,000 times less potent than 17b-estradiol (Howes

et al 2002). Very weak activity is typical of estrogens from plant sources

(Chadwick et al 2006).

 

There is no evidence that the effect seen in vitro would take place in vivo, and

much more research would be needed before any such conclusion could be drawn.

The report mentions that none of the boys had been exposed to any known

endocrine disruptor, such as medications, oral contraceptives(!), marijuana or

soy products. However, no mention is made of other known endocrine disruptors,

including organochlorine pesticides, PCBs, polychlorinated dioxins, alkyl

phenols, pthalates and parabens (Darbre 2006). Both pesticides and phthalates

have been found in essential oils, and both phthalates and parabens are commonly

found in cosmetic products.

 

Personal care products have been identified as contributing to phthalate body

burden in adult men (Duty et al 2005); phthalates are commonly found in cosmetic

products, and are potential hormone disruptors (Darbre 2006). DEHP, for example,

has hormone disrupting effects in both male and female rats (Lovekamp-Swan and

Davis 2003, Parks et al 2000), and high levels of several phthalates were found

in the blood of 28 of 41 pre-pubertal girls (68%) with premature breast

development compared to only 1 of 35 controls (3%) (Colón et al 2000).

 

It is, therefore, entirely possible that other ingredients or contaminants in

the products caused the gynecomastia. Pesticides, PCBs and dioxins are found in

the environment, often in food, and it is also possible that a local surge of

environmental hormone disruptors caused these cases in Colorado.

 

 

Conclusions

As the report states, breast growth in pre-pubertal boys is extremely uncommon,

yet three cases were reported within a short period of time, and all in the same

clinic. Considering that some 200 tonnes per annum are produced of both lavender

oil and tea tree oil, that most of this goes into personal care products, and

that very little of the evidence presented for these three cases is convincing,

the initial press reports of caution were premature, as are the cautions now

found on many websites.

 

Even if one or more of these cases was linked to product use, any connection

with either lavender or tea tree oil is unproven. Other endocrine disrupting

ingredients in the products could have played a role. Furthermore, we do not

know what other factors, such as dietary or environmental, may have played a

part.

 

The in vitro work reported by Henley et al (2007) does indicate a hormonal

effect. However, this cannot be extrapolated to estimate actual human risk,

especially without knowing more about the essential oil constituents causing the

in vitro effects seen, the amounts being applied to the body, and their

bioavailability.

 

No connection was established between the in vitro work and the three cases, and

the evidence for tea tree oil having an effect on prepubertal gynecomastia is

non-existent. Phytoestrogens generally have a very weak hormonal activity, and

it is implausible that the amounts of essential oil that enter the body from

product use would have a significant effect.

 

 

References

 

Cadby PA, Troy WR, Vey MG 2002 Consumer exposure to fragrance ingredients:

providing estimates for safety evaluation. Regulatory Toxicology & Pharmacology

36: 246-252

 

Cal K 2006 How does the type of vehicle influence the in vitro skin absorption

and elimination kinetics of terpenes? Archives of Dermatological Research 297:

311-315

 

Chadwick LR, Pauli GF, Farnsworth NR 2006 The pharmacognosy of Humulus lupulus

L. (hops) with an emphasis on estrogenic properties. Phytomedicine 13: 119-131

 

Colón I, Caro D, Bourdony CJ et al 2000 Identification of phthalate esters in

the serum of young Puerto Rican girls with premature breast development.

Environmental Health Perspectives 108:895-900

 

Cross S, Roberts M 2006 In-vitro human epidermal membrane penetration of tea

tree oil components from pure oil and a 20% formulation. A report to RIRDC

(Australian Rural Industry Research and Development Corporation)

 

Cross SE, Russell M, Southwell I et al 2008 Human skin penetration of the major

components of Australian tea tree oil applied in its pure form and as a 20%

solution in vitro. European Journal of Pharmaceutics & Biopharmaceutics

69:214-222

 

Darbre PD 2006 Environmental oestrogens, cosmetics and breast cancer. Best

Practice & Research Clinical Endocrinology & Metabolism 20: 121-143

 

Duty SM, Ackerman RM, Calafat AM et al 2005 Personal care product use predicts

urinary concentrations of some phthalate monoesters. Environmental Health

Perspectives 113:1530-1535

 

FMA 2007 http://www.fmafragrance.org/sub_pages/020107henleyresponse.pdf

 

Henley DV, Lipson N, KorachKS, Bloch CA 2007 Prebubertal gynecomastia linked to

lavender and tea tree oils. New England Journal of Medicine 365(5): 479-485

 

Howes M-JR, Houghton PJ, Barlow DJ et al 2002 Assessment of estrogenic activity

in some common essential oil constituents. Journal of Pharmacy & Pharmacology

54:1521-1528

 

Jäger W, Buchbauer G, Jirovetz L et al 1992 Percutaneous absorption of lavender

oil from a massage oil. Journal of the Society of Cosmetic Chemists 43:49-54

 

Lovekamp-Swan T, Davis BJ 2003 Mechanisms of phthalate ester toxicity in the

female reproductive system. Environmental Health Perspectives 111:139-145

 

Neustaedter R 2007

http://www.cure-guide.com/Natural_Health_Newsletter/Lavender_Dangers/lavender_da\

ngers.html

 

Nielsen JB 2008 What you see may not always be what you get - bioavailability

and extrapolation from in vitro tests. Toxicology in Vitro 22:1038-1042

 

Nielsen JB, Nielsen F 2006 Topical use of tea tree oil reduces the dermal

absorption of benzoic acid and methiocarb. Archives of Dermatological Research

297:395-402

 

Parks LG, Ostby JS, Lambright CR et al 2000 The plasticizer diethylhexyl

phthalate induces malformations by decreasing fetal testosterone synthesis

during sexual differentiation in the male rat. Toxicological Sciences 58:339-349

 

Reichling J, Landvatter U, Wagner H et al 2006 In vitro studies on release and

human skin permeation of Australian tea tree oil (TTO) from topical

formulations. European Journal of Pharmaceutics & Biopharmaceutics 64: 222-228

,

 

Robert Tisserand