B-Complex Vitamins
Support energy metabolism, nervous system function, and red blood cell production
Forms
Tablets, capsules, gummies; typically includes B1, B2, B3, B5, B6, B7, B9, B12
Advantages
Convenient way to cover multiple B vitamins at once; generally low toxicity risk
Disadvantages
Doses may exceed what most people need from diet alone; can cause bright yellow urine (harmless, from riboflavin)
Side effects
Nausea if taken on an empty stomach, bright yellow urine, rarely flushing from the niacin form
Interactions
May affect levodopa (Parkinson's medication) at high B6 doses
At-risk groups
Vegans and vegetarians, older adults, people under high stress, those with poor dietary variety
Cautions
High-dose B6 above 100 mg/day long-term is linked to nerve symptoms — check the product dose
Related symptoms
Educational information only — not medical advice. This content does not diagnose, treat, or replace consultation with a qualified healthcare professional. Always seek professional medical advice for symptoms, supplement use, or health concerns.