Tocopherol (Vitamin E)
In plain terms
Vitamin E, an essential nutrient and natural antioxidant added to products to keep their oils from spoiling. Also sold on its own as a supplement.
What the evidence shows
Tocopherol is vitamin E, an essential nutrient and a natural antioxidant, added to creams, oils, and foods to keep their fats from going rancid. At those amounts, and in a normal diet, it is well tolerated, and both the cosmetic safety panel and the FDA clear it for that use. Two things make it a matter of how it is used rather than a flat yes. The first is dose. Large trials of high-dose vitamin E pills read very differently from the trace amounts in a moisturizer: in a 35,000-man prevention trial, men taking 400 IU a day developed more prostate cancer, not less, and a pooled analysis linked high-dose supplements to a small rise in deaths from any cause. The benefit sits at moderate intake and the risk at high supplemental doses, the pattern researchers call a U-curve. The second is skin: a small share of people, roughly one in a hundred in patch-test clinics, react to it as a contact allergen, most often when it is applied straight to skin or to scars. So the answer turns on the form: a trace antioxidant in a product is one thing, a high-dose supplement is another.
On the label
Listed as tocopherol, tocopheryl acetate, or vitamin E. In a cream it is a minor antioxidant; on a supplement bottle the dose in IU is what matters, since the concern is high-dose pills, not the trace in a product.