These chemicals are associated with numerous health problems, but with regard to hormones, they’re bad for guys’ swimmers. The chemicals cause low sperm motility.

Glycol ethers are solvents used in a wide variety of industrial applications. But you’re most likely to encounter them via dry-cleaning services and in personal care products and cleaners. Avoid having clothes dry-cleaned (most fabrics can just as easily be hand-washed) and make your own cleaning products.

Parabens

Parabens are used as preservatives in the cosmetic and pharmaceutical industries. While no causal link with cancer has been established, parabens are controversial because they weakly mimic estrogen, and researchers have found measurable concentrations in breast tumors. Studies show that methylparaben (in some sunscreens) may react with sunlight to damage skin. Avoid cosmetics that list parabens or words ending in “-paraben” among the ingredients.

Air fresheners

Just like cleaning supplies, these are incredibly toxic and can aggravate respiratory problems like asthma. Even those labeled “pure” and “natural” have been found to contain phthalates, chemicals that cause hormonal abnormalities, reproductive problems and birth defects. Try simmering cinnamon and cloves to give your home an “I’ve-spent-the-whole-day-baking” scent, and leave a few windows open to let in fresh air. You might also boil a pot of water on the stove with a few drops of your favorite essential oil, or use an essential oil burner.

Ammonia

Ammonia is found in a variety of household cleaners—kitchen, bathroom, floor, oven, glass, and polishers. If the product is at least 5% ammonia, it has to be labeled as poisonous.

The U.S. National Library of Medicine maintains TOXNET, the Toxicology Data Network. According to TOXNET, short-term exposure to ammonia can irritate, burn, and even damage the eyes and skin. Ammonia is irritating to the respiratory tract and causes coughing, wheezing, and shortness of breath. Higher exposure can cause pulmonary edema, a life-threatening issue.

Hydrochloric Acid

Toilet bowl cleaners often contain hydrochloric acid, which is corrosive and will seriously damage any tissue it touches, irreversible damage. Protective equipment is an absolute requirement when handling any product that contains hydrochloric acid (or better yet, don’t handle it). Never mix hydrochloric acid-containing products with bleach as it will produce toxic gas!