A neurologist has issued a warning about a widely-used supplement that could turn 'toxic' in high doses. Dr Baibing Chen, known as Dr Bing on TikTok, warned that vitamin B6, which is often taken for energy and nerve function, can damage sensory neurons if consumed excessively.
Dr Chen explained that while many people assume vitamins are harmless because they are natural and available over the counter, certain vitamins can build up in the body and cause harm. He specifically highlighted vitamin B6, a water-soluble vitamin that is essential for energy metabolism and haemoglobin production, but can become toxic at high levels.
The neurologist said he has seen several cases of patients developing peripheral neuropathy—a condition characterised by numbness, tingling, burning pain, and balance problems—due to excess vitamin B6. He emphasised that the risk often comes from 'stacking', where people unknowingly consume multiple supplements and foods containing B6, such as energy drinks, multivitamins, and sleep aids.
The NHS supports this caution, stating that taking 200mg or more of vitamin B6 per day can lead to peripheral neuropathy, which may improve after stopping supplements but can sometimes be permanent. The health body advises adults not to exceed 10mg of vitamin B6 daily in supplements unless under medical supervision.
Dr Chen stressed that he is not against supplements but urged a personalised, evidence-based approach. 'We need to be smart about it,' he said, adding that recovery from B6-induced neuropathy is not always complete even after discontinuation.
