★★★★☆
BETTER BUT WITH SIDE EFFECTS
I took 900mcg of biotin for about three weeks recently for eyebrow growth. Although I got new eyebrow hair growth, I also developed itchy bumps along my jawline that started to spread to other areas of my face. Not pleasant! I have reduced the dosage to 300-600mcg a day (which I've been doing for a couple weeks) and I have experienced a few bumps here and there but no real itching. No obvious hair growth yet either.
Biotin
★★★★☆
BETTER BUT WITH SIDE EFFECTS
Good news/bad news regarding biotin. It worked great at growing hair.... I actually had eyebrows for the first time in years! But, I wound up with severe migraines. I have tried different brands and different strengths, but ended up with migraines each and every time. Just to let you know that some of us get negative side effects from biotin. I suffer from multiple chemical sensitivities.... not sure if this has anything to do with it or not.