What is benfotiamine?

Benfotiamine is a fat-soluble form of vitamin B1 (thiamine) that is absorbed more efficiently than standard thiamine and is studied for diabetic nerve symptoms at doses around 300–600 mg per day.

Can too much vitamin B6 cause nerve damage?

Yes. High long-term intakes of vitamin B6, generally well above the 100 mg/day adult upper limit, can cause sensory neuropathy. Check the B6 amount on any nerve formula label.

Does vitamin B12 help neuropathy?

B12 helps when a deficiency is the cause. Deficiency is common in older adults, vegans and long-term metformin users, and it is diagnosed with a blood test rather than guessed.

Benfotiamine and B Vitamins for Nerve Health

B vitamins are the backbone of most nerve support formulas. Some of that is well founded, some of it is marketing, and one of them can cause nerve damage if you take too much. Here is the practical version.

NU Nerve Review Editorial Team Updated May 7, 2026 8 min read

Neon visualization of a neuron with pink, blue and green nerve fibres

Why B vitamins matter to nerves

Peripheral nerves are metabolically demanding. Thiamine (B1) drives glucose metabolism, B6 is needed to build neurotransmitters, and B12 is required to maintain the myelin sheath that insulates nerve fibres. When any of these run short for long enough, the first symptoms are usually in the longest nerves: the feet, then the hands. Tingling, numbness and burning are the classic pattern.

Benfotiamine (vitamin B1)

Standard thiamine is water-soluble and poorly absorbed in large amounts. Benfotiamine is a fat-soluble derivative that reaches higher blood levels from the same dose. Trials in diabetic polyneuropathy have used roughly 300–600 mg per day over 3 to 12 weeks and reported modest improvements in symptom scores, most consistently in pain. Results are less impressive on objective nerve conduction measures — a pattern that repeats across this whole category.

Vitamin B12 (methylcobalamin)

This is the ingredient with the clearest logic: if you are deficient, correcting it matters, and deficiency-related neuropathy can worsen permanently if it is left alone. Higher-risk groups include adults over 60, people on long-term metformin or acid-reducing medication, vegans and vegetarians, and anyone after bariatric surgery. The right move is a blood test, not a guess. Methylcobalamin is the form most nerve formulas use.

The B6 warning most labels bury

Vitamin B6 is the exception to "more is fine". Long-term intake well above the adult upper limit of 100 mg/day is a recognised cause of sensory neuropathy — the very symptom people are trying to treat. If a formula lists several hundred percent of the daily value of B6, that is a reason to slow down and talk to a clinician, not a selling point.

Reading a nerve formula label

Per-serving amounts listed in mg or mcg for every active ingredient — not a blend total.
B6 kept at a sensible level.
Amounts you can compare with published trials (e.g. ALA 600 mg, benfotiamine 300–600 mg).
A manufacturer address, a lot number and a real refund window.

How this applies to NU Nerve

NU Nerve is marketed as a liquid formula containing benfotiamine and methylcobalamin among other nerve nutrients. Liquid delivery is a convenience feature, not a proof of effectiveness. Use the checklist above on the label you actually receive, and keep the B6 figure in view.

Sources

Medical disclaimer: this article is general information, not medical advice. Supplements are not intended to diagnose, treat, cure or prevent any disease. Talk to your doctor before starting any supplement, especially if you are pregnant, nursing, diabetic or taking prescription medication.