Vitamin B6 Blood Test

People experiencing nerve-related symptoms — tingling hands or feet, persistent low mood, or disrupted sleep — and those supplementing B6 at higher doses who need to confirm their levels are within the safe therapeutic range.

Your serum vitamin B6 level against clinical reference ranges. B6 deficiency manifests as neurological and mood symptoms — but B6 toxicity from over-supplementation also causes peripheral neuropathy, making this one of the few vitamins where both ends of the range matter.

B6 is unique among the B vitamins: the gap between therapeutic and toxic supplementation doses is narrower than most people realise. If you are taking a high-dose B6 supplement — common in many B-complex formulations — this test confirms whether your levels are optimal or approaching the range where neurological side effects can occur.