Might also be anecdotal but I *stg* my widow's peak grew back. I noticed it later in my cycle like week 10 or 11. I burned off my front hairline during high school like 20 years ago now bleaching it. I did use glow though so the bpc and tb might've helped
To be transparent though, my daily multi stack is a handful, I don't take a multivitamin. I do 1g tmg, 6g msm, d3, k2 (mk4 and mk-7), b complex, krill or fish oil (EPA/DHA content is the most important part), zinc, magnesium