How do the vitamins in this shampoo actually work on my hair?

The vitamins in this shampoo—specifically biotin, vitamin A, and vitamin E—along with panthenol (provitamin B5), function through cosmetic mechanisms to improve the physical properties of the hair shaft. Panthenol binds moisture to the hair, smoothing the shaft to increase flexibility and reduce mechanical damage from brushing. Biotin is included to support the appearance of fragile, dull-looking lengths, while vitamins A and E act as antioxidants to protect the scalp and hair surface from oxidative stress that can make hair look tired or rough. These effects are visible in how the hair feels and behaves—such as being smoother, easier to comb, and less straw-like—rather than altering biological processes. For best results, pair this shampoo with a suitable conditioner or balm, especially if your hair is long, porous, or bleached, to maintain the softness and gloss achieved during washing.