Oxybenzone | This chemical absorbs and filters UV light and is a common ingredient in sunscreen, despite causing relatively high rates of skin allergies. It also penetrates the skin at very high rates and acts like estrogen once it enters your bloodstream, disrupting your endocrine system, reducing sperm production, and potentially causing endometriosis.

Octinoxate | Octinoxate is also readily absorbed via the skin and also disrupts your endocrine system by mimicking hormonal activity that can affect the reproductive system and thyroid.

Retinyl Palmitate | A form of Vitamin A, this chemical is used in a large number of sunscreens and SPF- containing moisturizers and lip balms because it is believed to slow skin aging. But, when exposed to sunlight, it has been shown to speed the development of malignant cells and skin tumors because UV rays cause the compound to break down and produce destructive free radicals.

Homosalate | This common ingredient also helps sunscreen penetrate your skin and disrupts hormone balances. It can accumulate in your body faster than your body can detoxify it through your liver, lingering in your body and increasing your toxic burden.

Octocrylene | This is yet another ingredient that is easily absorbed by the skin and produces free radicals that can cause mutations and damage cells when exposed to UV rays.

Parabens | Parabens are a group of synthetic compounds commonly added to cosmetics and body products because they prevent the growth of fungus and bacteria. They are dangerous because, like so many ingredients in this list, they disrupt hormone functions, potentially leading to increased risk of breast cancer and reproductive toxicity. Five common types of parabens have been banned in the EU, and the FDA is under pressure to ban them in the U.S.