Despite the price of OneSource, I had good results. I usually keep an eye on my nails when I buy a hair product. Usually what is good for your hair is also good for your nails. It has MSM, Biotin and L-Cystiene in it and all of those are good for hair and nail growth. My nails grew faster and stronger! I am taking TGVITW and it works great for me. I haven't noticed any increased growth or anything, but I'm not taking it for my hair, just my overall health. I found out that even though they are expensive, they don't contain any of the synthetics that other vitamins contain, which means your are actually absorbing more of the vitamins that it contains.