In a sea of powders, gummies, pills, and shots promising thicker and fuller hair, Nutrafol is one of the few hair growth products that actually delivers results. Be patient: results can take three to six months—and you’ll need to keep taking it to maintain your new hair growth. It works by fighting off inflammation and free radicals that impair follicle function. Vitamin E, keratin, marine-based collagen, and hyaluronic acid speed up growth, promote absorption of hair-boosting nutrients, and add oomph from the inside out.