http://www.longshorthair.com/boost-hair-vitamins-for-growth/
Is it safe to take one tablet of vitamin B-100 and 5000 mcg of biotin daily?
I'm very busy studying full time with life Schools turbulent family and 2 jobs, I'm stressed and it affects my hair … So I try to promote healthy hair and nail growth with biotin. As you can imagine, also need a boost to my energy level … so I'm trying the B-100. (Caffeine bothers me a little, makes my heart beat funny.) Is sure? He also announced in vitamin A and calcium in multiple complex … but I will not do it too. I heard that you can not overdose on vitamins because the body no need to get rid of … but I'm not sure. Thanks for the input in advance! 
Yes it is safe. I take Biotin for my hair, well, but I'm Sundown High Power B & C Complex tablets is the formula of free time and work very well. U exercise when given the choice, because it certainly helped me to cope with stress. Good luck.
Update: Growth Journey 1