Additional Information

Additional Information

Account Navigation

Account Navigation

Currency - All prices are in AUD

Currency - All prices are in AUD
 Loading... Please wait...


Study Shows Sunscreen Absorbed into the Body at Up to 360 Times More Than FDA Allows

Posted by Peter Eckhart, MD (Renwin Yee, MD) on

FDA researchers tested 6 main ingredients in sunscreens.  All of these chemicals had concentrations in the blood above the FDA threshold of 0.5 nanograms (ng - a nanogram is a billionth of a gram) per milliliter (mL) of  blood plasma.  These ingredients were above the FDA threshold for seven days AFTER the sunscreens were applied.  Two of the toxic ingredients were above the threshold for 21 days AFTER the sunscreen was applied.  One chemical, oxybenzone, weighed in at 180.1 ng/mL.  Oxybenzone blood levels were 360 times more than the FDA recommends.

Naysayers point out that nanograms are very small.  One nanogram is one billionth of a gram.

However, these chemicals are concerning because they are hormonally active.  Hormones are active at extremely tiny amounts.  For instance, a normal estradiol level in a human female is 0.1 parts per billion or 0.1 ng/mL.  Oxybenzone was found on day 4 after application to be 180 ng/mL.  Thus, the oxybenzone is 1800 times the concentration of estradiol in a woman!!!!

I really can't understand how any naysayer in their right mind can say that this is fine and simply say that the oxybenzone concentration is too small to be considered.  Oxybenzone mimics estrogen.  Oxybenzone is a xenoestrogen.  Oxybenzone is a "Franken" Estrogen.  Is anybody listening?

The oxybenzone is 1800 times the concentration of estradiol in a woman from a routine application of sunscreen that contains oxybenzone.

This is the structure of oxybenzone.  Oxybenzone is a xenoestrogen.

This is the structure of estradiol.  Estradiol is your own native women's hormone that your body produces.

Magaret Schlumpf and her fellow researchers at the Institute of Pharmacology and Toxicology at University of Zurich in Switzerland found that many of the active chemicals used in sunscreens act as "Franken" Estrogens.[1]  She and her team tested six chemicals commonly used in cosmetics as sunscreens.  Five of the six of them tested positive for mimicking strong estrogen.  They caused cancer cells to grow rapidly in the lab. These chemicals were:

benzophenone-3, homosalate, 4-methyl-benzylidene camphor (4-MBC), octyl-methoxycinnamate and octyl-dimethyl-PABA

Only one chemical butyl-methoxydibenzoylmethane (B-MDM) did not show any activity. 4-MBC a common ingredient in sunscreen caused a doubling of the rate of uterine growth far before puberty.  The 4-MBC was mixed with olive oil and applied to the rat skin.  Schlumpf was taken aback by this result because these were concentrations that are well within the concentrations allowed for sunscreen.  She commented that 3 out of the 6 chemicals caused developmental aberrations in the animals.

A major cause of infertility in America is endometriosis.  Exposure to excessive estrogen causes endometriosis.  Could sunscreen be contributing to endometriosis?

Here is a more review recent article on the endocrine disruption of different chemicals used in sunscreen.[2]


1.  Schlumpf , Margaret; Beata Cotton, Marianne Conscience, Vreni Haller, Beate Steinmann, Walter Lichtensteiger. In vitro and in vivo estrogenicity of UV screens. Environmental Health Perspectives Vol. 109 (March 2001) pp 239-244.

2. Jiaying Wang, Liumeng Pan, Shenggan Wu, Liping Lu, Yiwen Xu, Yanye Zhu, Ming Guo, and Shulin Zhuang, Int J Environ Res Public Health. 2016 Aug; 13(8): 782.

Published online 2016 Aug 3. doi: 10.3390/ijerph13080782

You can read about the articles here:

Palau Becomes the first country to ban Endocrine Disrupting Toxic Chemicals in Sunscreens

Palau bans "Reef Toxic" Sunscreen Creams.  Palau was once heralded as one of the best places in the world to scuba dive by Jacques Cousteau.  When I was a kid, Jacques Cousteau was my hero.  His undersea videos shown on network TV inspired me to almost go into marine biology.Well, it turns out that minute [...]

Read More »

National Institute of Health of the US Government Says Endocrine Disrupting Chemicals are a Problem

There have been some agitation from a minority of my customers that I am making up these endocrine disruptor concerns.  I am just repeating and refining the information provided by the National Institute of Health of the US Government, or NIH (  On this link the NIH, says that Endocrine Disruptors are no joke, and [...]

Read More »

Women with High Levels of Phthalates (Chemical Hormone Disruptors) Have Low Sex Drive

Scientists at the American Society for Reproductive Medicine recently found that women the had high levels of an endocrine (hormone) disrupting chemical, phthalate, had a low sex drive. Barrett, the researcher, believes that certain phthalates may lead to decreased sex drive in women. Women that had high levels of a certain phthalate metabolite [...]

Read More »

Avocados Seem to be a Xenoestrogen

Recently Aug. 2, 2019, I had a patient with severe endometriosis. She switched to all xenoestrogen FREE products from our purple sheet. Immediately, she had severe 10 out of 10 pain that lasted for several days. She said that she only had that kind of 10 out of 10 pain once a [...]

Read More »

Tequila alcohol (Agave) May be an Abortifacient

Wow.  I just got off the phone with a patient.  She was pregnant 5 weeks and reported having a cramping episode last week.  This made me extremely nervous as a cramping episode during pregnancy could be the beginnings of a miscarriage.  She said that she didn't know she was pregnant and she had an alcoholic [...]

Read More »

Obesity Epidemic is in part Created by Endocrine Disruptors

I was watching Fed Up, a documentary on the Obesity Epidemic.   2 out of every 3 Americans are overweight.  The film claimed that the Obesity Epidemic was world wide.  The typical prescription given given was that we need to exercise more and eat less.  Despite this mantra, weight is still going up.  Also, 6 month [...]

Read More »

National Institute of Environmental Health Web Page on Endocrine Disruptors

I found a website that gives a good overview on endocrine disruptors. The National Institute of Environmental Health (NIEHS) has a nice short page on chemical endocrine disruptors. They report that endocrine disruptors can be found in everyday products including plastic bottles, metal food cans, detergents, flame retardants, food, toys, and pesticides.NIEHS supports studies to determine the correlation [...]

Read More »

Natural Progesterone Reverses Traumatic Brain Injury - Case Study

Recently, I found this video on using Natural Progesterone for Traumatic Brain Injury. One of my young patients was playing basketball. An opposing team member ran into her, and she had a brain concussion. I found out about the accident several months later. She was still having the effects of the brain injury. [...]

Read More »

European Union has Banned or Restricted 1,300 Chemicals in Cosmetics Alone, the United States only 11 Chemicals

Here is the link for the original article on the Guardian.The Guardian recently published an article stating that the European Union has restricted or banned 1,300 chemicals in cosmetics alone.  The United States has only banned 11 chemicals.A brief piece of legislation that was considered in Connecticut in January 2019 unlikely to pass contained just 3 lines “meet the chemical [...]

Read More »