She does not understand why bought))). I took "the surrender" as a probe. Of course, one week no effect for hair-skin-nails did not see. Well, maybe to see how the body will react to such a horse dose of biotin. No unpleasant moments while taking the drug I have not noticed, allergies and side effects were not. Small capsules, drink easily. Once a day with food. For better absorption it is recommended to take B vitamins in this preparation is "therapeutic" large dosage that is required if you have problems with hair. If you want to take biotin just for prevention, we can restrict and fewer mg. ********** I hope my review was helpful to you ;-))