Hey Ladies, I've taken Manetabolism regularly for 1 year now and I cannot honestly say I've seen a noticeable difference in hair or nail growth from it. I have had very clear skin with minimal breakouts which could be a combo of the vitamins and my skin care routine. DISCLAIMER: I did NOT track my progress and I did get regular trims every 3 months in 2015.
I'm going to switch to Mielle Organics Healthy Hair Formula Vitamins for 1-2 months after my last bottle of Manetabolism runs out this month. Depending on my results (these vitamins are tablets and a larger in size) I may return to Manetabolism since I did not have any negative effects and I think it is a good multi-vitamin regardless of hair growth (especially if I conclude that its been a factor in keeping my skin clear).
Good luck!