While these are technically multivitamins and not specifically targeted for hair growth, they’re packed with essential ingredients like Omega-3 and vitamin D, which professionals recommend to help keep it strong. They’re also encased in a slow-release capsule so your body can better absorb their nutrients. “I usually try and rectify diet first, but if I had to recommend a key ingredient for overall hair health, I would say Vitamin D,” adds Sey. “Most people are deficient, and it’s important for many vital functions within the body.”