I breastfed both my girls to the best of my ability and plan on doing the same with my next baby along with supplementing with formula. (babycenter.com)
I don't know if that's really safer though like, for a mother to take that much of supplement of vitamin compared to a baby taking 10 % of that. (pregnancymagazine.com)
Both of those factors determine doses for supplements for animals. (tangoherbs.com)