I Started Taking B-complex Three Months Ago. It Seems At

I started taking b-complex three months ago. It seems at this time my hair started falling out. Alopecia . Prior to starting b-complex, I take CoQ-10, apple cider vinegar cap lets, krill oil, vitamin c, and multivitamin. I've had blood tests for thyroid , hormones, testosterone, kidney, liver etc. all normal. I go to a gym every day the. Come home and do quick mile power walking . Also under a lot of stress but always manageable. I am 49 yrs old. Is it a mix of my vitamins that brought this on. No history of this in my family.