Studies don't back this.
We reviewed the trials we hold for beauty. The results for vitamin E and biotin were not strong enough to credit. An oral vitamin E capsule is not a beauty treatment or a sunscreen. The clean vitamin-E-only study found no meaningful protection from sun sensitivity, while positive combination studies cannot tell us what vitamin E contributed. The 'hair vitamin' story is mostly marketing. Biotin only helps hair or nails in people who are genuinely deficient or have specific brittle-nail problems; there is no good evidence it improves healthy hair, skin and nails. High beauty doses can also interfere with important blood tests.
See the evidence behind this answer in the complete report, including what was tested, the dose and preparation used, who took part, and funding information where available.
