My hair grows pretty fast but I dont measure. In about 2 years I would say that my hair was 2 inches above bsl from just above shoulders. I had regular trims and when I say it was bsl, it was a full bsl, not one strand at bsl...so I think I grow about 6 inches a year and that was without supplements. These biotin though is giving me great thickness and possible growth, well know for sure what I grew the first week of April when I blowout and do a month comparison.