Is Your Sunscreen Doing More Harm Than Good?

This article was originally published by our friend Dr. Mercola 

Vitamin D, often referred to as “the sunshine vitamin,” is different from other vitamins in that it influences your entire body.

And, while scientists refer to vitamin D as a vitamin, it is actually a steroid hormone obtained from sun exposure, food sources and supplementation. Vitamin D receptors have been found in almost every type of human cell, from your brain to your bones.

Unfortunately, dermatologists and the media do the public a great disservice by recommending avoiding the sun to decrease skin cancers.1,2

This is because these “experts” fail to realize that vitamin D deficiency not only raises your risk of skin cancer3 but many of the most common cancers as well, which claim far more lives than the deadliest skin cancer, melanoma.

Breast4 and prostate5,6 cancers are just two examples where low vitamin D renders you more vulnerable to more aggressive forms of the disease. Low vitamin D also raises your risk for heart disease, diabetes, osteoporosis and other chronic diseases.

The scientific evidence, now running in excess of 34,000 studies, details the many benefits of UV exposure, both for vitamin D production and other benefits that are completely unrelated to vitamin D.

The most important thing you can do to prevent skin cancer is to spend a sufficient amount of time in the sun as frequently as possible, ideally close to daily to maintain an optimal vitamin D level.

A primary risk factor for skin cancer is intermittent overexposure, not sensible exposure. Appropriate sun exposure means, first and foremost, avoiding sunburn. As long as you avoid sunburn you are getting the benefits of sun exposure.

Sunscreen Chemical Is Lethal to Horseshoe Crabs

Avoid shielding yourself from the sun’s rays by slathering on chemical sunscreens, many of which have been linked to an increased risk of skin cancer, as noted by clinical laboratory scientist Elizabeth Plourde, Ph.D.,7 in the video above. Sunscreens have also been implicated in the destruction of corals and other sea life.

A recent symposium on emerging environmental contaminants highlighted the environmental dangers associated with widespread sunscreen use. According to University of Delaware marine biologist Danielle Dixson, the chemical oxybenzone in sunscreens is lethal to horseshoe crab eggs.

In Delaware, beach season coincides with the spawning season of horseshoe crabs, and since they lay their eggs in the sand in shallow water, they’re particularly vulnerable to chemical contaminants introduced by beachgoers.

Researchers estimate sunscreen-wearing beachgoers introduce as much as 6,000 metric tons of sunscreen into the world’s oceans each year. As reported by Cape Gazette:8

“‘Sunscreen exposure strongly influences the development, growth and survivorship of the horseshoe crab egg and larvae,’ [Dixon] concluded …

The chemical found in Hawaiian Tropic used in Dixson’s study is oxybenzone, which has been found to alter the DNA of coral, increase susceptibility to coral bleaching and disrupt the endocrine systems of marine animals.

Research has found the chemical impacts aquatic life at a concentration of 62 parts per trillion — the equivalent of one drop of water in about six Olympic-size pools, Dixson said.”

Sunscreens Contain Many Potentially Hazardous Chemicals

While some sunscreen manufacturers have switched from oxybenzone to avobenzone, researchers like Dixon note no studies have been done to confirm whether avobenzone is actually a safer choice. Chances are, it’s not.

Disturbingly, recent research by the Center for Disease Control and Prevention found 96 percent of the U.S. population has oxybenzone in their bodies, and this chemical is a known endocrine disruptor linked to reduced sperm count in men and endometriosis in women.9

Disturbingly, at least nine of the sunscreen ingredients the U.S. Food and Drug Administration (FDA) has approved are known endocrine disruptors.10

Aside from oxybenzone — which is found in 70 percent of sunscreens — other commonly used chemicals that can enter your bloodstream and can cause toxic side effects, including hormone disruption, include but are not limited to:11,12

Octyl methoxycinnamate (OMC) Para-aminobenzoic acid (PABA) Octyl salicyclate
Phenylbenzimidazole Octocrylene Octisalate
Dioxybenzone Menthyl anthranilate Homosalate
Octinoxate Cinoxate Parabens

Many sunscreens also contain vitamin A and/or its derivatives, retinol and retinyl palmitate, which have been linked to an increased risk of skin cancer by increasing the speed at which malignant cells develop and spread.

Beware of Nanoparticles

Spray-on sunscreens13 pose an additional hazard by releasing toxic particles into the air. The FDA has previously expressed concern that inhaling these products may be risky, especially to children, and has warned parents to avoid spray-on sunscreens.14,15

The two agents of greatest concern are zinc oxide and titanium dioxide, as these are the two most often used in spray-on sunscreen products. These two minerals are the safest topical sunscreen agents around, but inhaling them is a whole different story.

Most studies to date have shown that zinc oxide and titanium dioxide are safe and unlikely to penetrate your skin when applied topically, as long as they are not nanosized.

But when these minerals are inhaled, they have been shown to irritate lung tissues and potentially lead to serious health problems,16 and the finer the particles, the worse their effects appear to be.

The International Agency for Research on Cancer (IARC) has classified titanium dioxide as a “possible carcinogen” when inhaled in high doses.17 According to IARC:18

“Titanium dioxide causes varying degrees of inflammation and associated pulmonary effects including lung epithelial cell injury, cholesterol granulomas and fibrosis. Rodents experience stronger pulmonary effects after exposure to ultrafine titanium dioxide particles compared with fine particles on a mass basis.”

Safe Versus Unsafe Titanium Dioxide and Zinc Oxide

Most nanoscale particles (microscopic particles measuring less than 100 nanometers)19 found in American sunscreens are either titanium dioxide or zinc oxide.20 Animal research has shown that inhaled nanoparticles can reach all areas of your respiratory tract and, since your lungs have difficulty clearing small particles, they may be allowed to pass into your bloodstream.

Other studies have proven some nanoparticles are even able to cross your blood-brain barrier. If allowed to enter your lungs or penetrate your skin, nanoparticles therefore have the potential to cause widespread damage to your cells and organs, immune system, nervous system, heart and brain.21,22 Some scientists postulate that the toxic effects of nanoparticles relate to their size being in the range of a virus, which may trigger your body’s immune response.23

Inhaling higher amounts of zinc oxide can also lead to “metal fume fever,”24 characterized by chest pain, cough, dyspnea, reduced lung volumes, nausea, chills, malaise and leukocytosis. One animal study found zinc oxide nanoparticles to be cytotoxic, interfering with zinc homeostasis, elevating zinc levels and resulting in apoptosis (cell death).25

An Indian study concluded that zinc oxide particles cause toxicity in human lung cells possibly through “stress-induced apoptosis.”26

Human studies are sorely lacking as to the health effects of inhaling of zinc oxide particles, especially at lower levels, such as from brief exposure to sunscreen spray. However, using these spray-on products are clearly an unnecessary risk since safer options are readily available. Your safest bet is to use topical zinc oxide or titanium dioxide that does not contain nanosized particles.

Sun Avoidance Promotes Early Death

One of the most compelling reasons for getting regular, sensible sun exposure on bare skin is that it promotes optimal physical and psychological health and helps prevent chronic diseases of all kinds. As noted in a scientific review27 by dermatologist Dr. Richard Weller, sun exposure has cardiovascular benefits independent of vitamin D, and cardiovascular disease is a far greater public health problem than skin cancer.

In fact, research suggests your risk of dying from heart disease or stroke is 800 percent greater on average than your risk of dying from skin cancer.28 One of the key messages in Weller’s paper is that public health messages really should be determined based on all-cause mortality, not a singular disease.

“Sunlight is a risk factor for skin cancer, but sun avoidance may carry more of a cost than benefit for overall good health,” he writes. Another study29 published in the journal Public Health Nutrition in 2012 also concluded that:

“The overall health benefit of an improved vitamin D status may be more important than the possibly increased CMM (cutaneous malignant melanoma) risk resulting from carefully increasing UV exposure. Important scientific facts behind this judgment are given.”

Even though Weller is ahead of the pack in recognizing the importance of sun exposure, he and most other physicians don’t understand why this is so. There are many reasons, but two large ones are:

  • Exposure to the sun increases nitric oxide production, which will relax blood vessels, lower blood pressure and decrease platelet activation, making your blood thinner and less likely to clot and form a stroke or heart attack. Nitric oxide will also improve your immune function.
  • Red and infrared rays are rarely discussed but recent research has shown that red at 660 nm and near infrared at 830 nm both have powerful benefits on improving mitochondrial function. This is because cytochrome c oxidase, which is one of the electron transport chains in the mitochondria, are chromophores for those wavelengths and when they absorb that energy the efficiency of ATP and mitochondrial cellular energy is increased.

Sun Avoidance Is as Risky as Smoking

A study30,31 driving home this risk-benefit reality was done in Sweden. More than 25,500 Swedish women between the ages of 25 and 64 were followed for 20 years. Detailed information about sun exposure habits and confounding factors were obtained and analyzed in a “competing risk” scenario. Overall, women who got regular sun exposure did have a higher risk for melanoma compared to sun avoiders, but they also had a lower all-cause mortality risk, likely due to their increased vitamin D levels.

Women with active sun exposure habits ended up having a lower risk of cardiovascular disease and non-cancer death compared to those who avoided the sun. According to the authors:

“Nonsmokers who avoided sun exposure had a life expectancy similar to smokers in the highest sun exposure group, indicating that avoidance of sun exposure is a risk factor for death of a similar magnitude as smoking. Compared to the highest sun exposure group, life expectancy of avoiders of sun exposure was reduced by 0.6 [to] 2.1 years.”

In short, if you’re concerned about mortality, and not just mortality from one specific disease (melanoma), the scales are decidedly tipped toward sun exposure being of tremendous benefit. Five of the many noteworthy properties of spending some quality time in the sun include:32

  1. Pain-killing (analgesic) properties
  2. Increased subcutaneous fat metabolism
  3. Regulation of human lifespan (solar cycles appear to be able to directly affect the human genome, thereby influencing lifespan)
  4. Daytime sun exposure improves evening alertness
  5. Conversion to metabolic energy (i.e., we may “ingest” energy directly from the sun, like plants do)

Reduce Your Risk of Sunburn With ‘Internal Sunscreens’

As mentioned, one of the primary risk factors of skin cancer is sunburn, which is an inflammatory process. Aside from paying careful attention to covering up before you get burned, you can reduce your risk of sunburn by eating plenty of antioxidant-rich fruits and vegetables, and/or taking an astaxanthin supplement. The latter has been shown to work as an effective internal sunscreen, protecting your skin from UV radiation damage.

In addition to copious testimonials and anecdotal evidence, scientific studies have substantiated these skin protective effects.33 In one study, subjects who took 4 milligrams (mg) of astaxanthin per day for two weeks showed a significant increase in the amount of time necessary for UV radiation to redden their skin. Animal studies lend further evidence to astaxanthin’s effects as an internal sunscreen:

  • In one study, mice were fed various combinations of astaxanthin, beta-carotene and retinol for four months. Astaxanthin was substantially effective in preventing photoaging of the skin after UV radiation, as measured by markers for skin damage34
  • A rat study found astaxanthin was found to be 100 times stronger than beta-carotene and 1,000 times stronger than lutein in preventing UVA light-induced oxidative stress35
  • The Journal of Dermatological Science published a study in 2002 finding astaxanthin is able to protect against alterations in human DNA induced by UVA light exposure36

How to Choose a Safer Sunscreen

There are thousands of sunscreens on the market and it may seem daunting to find a safe one. The majority of chemical sunscreens contain endocrine disruptors, which are particularly risky for pregnant women, infants and small children. These can disrupt growth and development, cause early puberty and result in small testicle size and low sperm count in boys. They also have carcinogenic potential.37

Among the worst are those containing oxybenzone, synthetic fragrances and retinyl palmitate. When choosing a sunscreen, your safest choice is a lotion or cream with zinc oxide. It’s stable in sunlight and provides the best protection from UVA rays.38 Your next best option is titanium dioxide. Just make sure the product:

  • Does not contain nano sized particles
  • Protects against both UVA and UVB rays

Keep in mind that SPF protects only from UVB rays, which are the rays within the ultraviolet spectrum that allow your skin to produce vitamin D. The most dangerous rays, in terms of causing skin damage and cancer, are the UVA rays. Avoid sunscreens with an SPF above 50.

While not intrinsically harmful, the higher SPF tends to provide a false sense of security, encouraging you to stay in the sun longer than you should. Moreover, higher SPF typically does not provide much greater protection. In fact, research suggests people using high-SPF sunscreens get the same or similar exposure to UV rays as those using lower-SPF products.


A quick note from our founder-

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The 5 Most Dangerous Lies You’ve Been Told About Bread

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wisemindhealthybody.com