PubMed Central is a free digital archive of biomedical and life sciences journals made available by the U.S. National Institutes of Health (NIH). Actual scientific studies and their findings are published here, with many studies on the effects on various ingredients on the human body. We at Lavera find this database invaluable.

Here are some examples of studies found on PubMed:
Human Breast Milk Contamination with Phthalates leads to exposure of fetus which could lead to sexual development disorders.
Analysis of 2,517 urine samples from US population shows 96.8% exposed to benzophenone-3, a common sunscreen ingredient where animal studies have shown effects in liver, kidney, and reproductive organs.