Taking a daily B-complex without an actual shortfall isn't harmless: past a certain threshold, B6 can damage peripheral nerves (tingling, numbness), and excess B2 turns urine bright yellow. High-dose B vitamins are only useful for correcting an identified shortfall, not as a preventive daily routine.

noli's read

Source: a clinical summary (Verywell Health) and two reviews on vitamin B6 toxicity (StatPearls; a case-based review, Rheumatology International, 2025). Evidence type: clinical case reports and literature reviews on B6-related neuropathy. The data confirm that peripheral neuropathy from excess B6 is documented at doses as low as 200mg/day taken over several months — far above normal dietary intake (~1.9mg/day) but commonly reached with 25-100mg tablets taken daily without a break. The bright-yellow urine from excess riboflavin (B2) is real but harmless. The post's message — know the right timing and dose, avoid daily use without an identified shortfall — is consistent with this evidence and with the broader principle that excess water-soluble vitamins aren't automatically harmless just because they're excreted in urine. Direction: causal, case reports with symptom regression on discontinuation.

the sources

No named source held this one up — that absence is part of the verdict.