Neurologist Issues Critical Warning on Vitamin B6 Supplement Toxicity
A prominent neurologist has issued a stark warning that a widely consumed vitamin supplement could turn "toxic" when taken in excessive amounts, leading to severe nerve damage and permanent health consequences. Dr Baibing Chen, known as Dr Bing, emphasised that many people mistakenly believe vitamins are harmless because they are natural and available over the counter, but this is not always the case.
Fat-Soluble and Water-Soluble Vitamins Pose Risks
In a detailed video shared on TikTok, Dr Bing explained that both fat-soluble and water-soluble vitamins can accumulate to dangerous levels in the body. Fat-soluble vitamins like A, D, E, and K can build up in tissues, while even water-soluble vitamins such as B and C are not always harmless, contrary to the common belief that excess amounts are simply excreted.
He specifically highlighted vitamin B6, also called pyridoxine, which is essential for energy metabolism and haemoglobin production. Naturally found in foods like pork, poultry, peanuts, soya beans, oats, and bananas, B6 is crucial for bodily functions, but supplemental overdose disrupts neuronal signalling.
How Excessive B6 Causes Nerve Damage
Dr Bing stated, "At high levels, B6 becomes more toxic, and it disrupts normal neuronal signalling and can overstimulate and damage sensory neurons, leading to degeneration of those nerve fibres." This damage manifests as peripheral neuropathy, with symptoms including numbness, tingling, burning pain, and balance problems due to distorted sensory input to the brain.
The risk is not from a single large dose but from "stacking" multiple supplements containing B6. Dr Bing cited a case of a young patient who developed neuropathy from taking multivitamins, energy drinks, anti-stress supplements, and sleep aids daily, all containing B6 unknowingly. Recovery after stopping supplements is not always complete.
NHS Guidance Supports the Warning
The NHS website corroborates this warning, noting that taking 200mg or more of vitamin B6 daily can cause peripheral neuropathy, potentially permanent if large amounts are consumed over months. Effects of doses between 10mg and 200mg are unclear, and the NHS advises not exceeding 10mg daily in supplements without medical advice.
Dr Bing clarified he is not against supplements overall, recommending them when indicated and using some himself, but stressed the need for individualised, evidence-based use to avoid toxicity. This caution underscores the importance of monitoring supplement intake and consulting healthcare professionals to prevent irreversible nerve damage from common vitamins like B6.
