Because Biotin needs vary with age, we suggest working with your primary care physician to help you determine your personal needs. According to the National Institutes of Health, the daily recommended intake for biotin is 50 micrograms per day for infants 12 months and younger, 150 micrograms for infants between 12 months and four years, and 300 micrograms for adults, children over four, and pregnant or breastfeeding women.