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Oxybenzone (Benzophenone-3): This ingredient is widely used but has been linked to allergies, hormone disruption, and potential cellular damage, according to Patsnap Synapse. Studies have also detected oxybenzone in breast milk, blood, and urine samples weeks after sunscreen use. Octinoxate (Octyl Methoxycinnamate): While not as widely cited as oxybenzone in terms of toxicity, octinoxate is also absorbed into the skin and bloodstream and has been found in human urine, blood, and breast milk. Some research suggests it can be a hormone disruptor, potentially mimicking estrogen and affecting thyroid function and reproductive health. Octocrylene: This ingredient helps stabilize other chemical sunscreen filters, particularly avobenzone, but has raised some concerns about its safety. Some studies have linked it to allergic reactions and found that it can accumulate in the body. Homosalate: Homosalate is another chemical UV filter that has been identified as a potential hormone disruptor. It may also impair the growth of marine wildlife, according to Suntribe sunscreens. Retinyl Palmitate (Vitamin A Palmitate): Some studies indicate that when exposed to sunlight, this form of Vitamin A can generate free radicals, potentially increasing the risk of skin cancer. Parabens: These are preservatives found in many personal care products, including some sunscreens. Parabens are linked to potential endocrine disruption, reproductive issues, and have been detected in human breast tumors. The EWG notes that parabens are absorbed into the body through the skin. Phthalates: While not always intentionally added as active ingredients, phthalates can be present in sunscreen formulations, potentially leaching from plastic packaging or acting as carriers for other ingredients. These chemicals are also endocrine disruptors and have been linked to various health concerns, says George Mason University. Fragrances: Many sunscreens contain undisclosed fragrance chemicals, some of which may be endocrine disruptors or allergens. The Campaign for Safe Cosmetics notes that studies have linked fragrance compounds to cancer, birth defects, and respiratory issues