hmmm began taking hairfinity first by 1 in the morning and 1 at night....but then after a week and a half, i missed 1 of the vitamins so i started taking both in the morning....i thought you had to take them apart...but when i began taking both at the same time i seen a difference....and my nails are growing like crazy....whooohooo for hairfinity...almost done with my first bottle and my second is coming in.....i'm loving the results so far