Oziva plant-based biotin for healthy hair and nails I don't try supplements without being sure, but Oziva has my trust. I have been using their protein supplement after workout which has proven to be quite effective for me. So I started using their plant based biotin for nails and hair and this too has worked out for me. I take 2 scoops of it in 200ml of water every night and that is pretty much enough for healthy hair, skin and nails. Most importantly it doesn't have side effects as it is extracted from natural sources!