While collagen is known as a wonder ingredient, biotin, on the other hand, is known as a "beauty superstar," per Vegamour. Known as vitamin B-7 or vitamin H, biotin is "important for cell growth and fatty acid metabolism." This vitamin aids your body's conversion of fats, proteins, and carbohydrates into energy, and its supplements are vegan, unlike collagen. Moreover, they're water-soluble, so your body doesn't store them.

According to Vegamour, some have claimed that biotin helps pregnant women maintain their health, as well as it being good at regulating blood sugar. But does it help your hair and nails? Verywell Health explained that biotin is believed to aid thinning hair as well as strengthening nails. It's also said to stimulate the growth of both nails and hair. It does this through promoting keratin, a protein common in nails and hair, per Vegamour. This fortification of your nails and hair can help protect them from future damage, too.

What everything boils down to, according to Vegamour, is that collagen better maintains your skin while biotin better aids your hair and nails. The best part, though, is that they can be used in conjunction with one another. They complete slightly different tasks but operate in the same arenas, so if you choose both, you'll fortify yourself brilliantly.