Peripheral Neuropathy: The Evidence-Based Supplement Protocol

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Peripheral neuropathy has many causes — diabetes is the most common in developed countries. Identification and treatment of the underlying cause (glycemic control, B12 deficiency repletion, alcohol cessation, gluten exclusion in celiac) is foundational. Several supplements have credible RCT evidence as adjunctive nerve-targeted therapy.

Alpha-Lipoic Acid (ALA), 600 mg Daily

ALA has European regulatory approval for diabetic neuropathy. The SYDNEY 2 trial in 181 adults showed ALA 600 mg/day for 5 weeks reduced Total Symptom Score and Neuropathy Impairment Score versus placebo. The NATHAN 1 trial showed improvements over 4 years on NIS-LL. Take fasted. See ALA piece.

Benfotiamine, 300–600 mg Daily

Benfotiamine has substantially better tissue penetration than thiamine HCl and reduces neuropathic pain scores and improves vibration perception in diabetic neuropathy. See our thiamine piece.

Vitamin B12 — Test and Replete

B12 deficiency produces a sensory-predominant neuropathy that responds to repletion. Annual B12 + MMA in adults on metformin (which depletes B12) or on PPIs >2 years or with risk factors (vegetarian, post-bariatric, atrophic gastritis). Replete with hydroxocobalamin. See B12 form piece.

Acetyl-L-Carnitine, 1,000 mg Twice Daily

ALCAR has positive RCT data in diabetic and chemotherapy-induced peripheral neuropathy. Effect modest but consistent across trials. See ALCAR vs LCAR piece.

Vitamin D — Repletion in Deficiency

Vitamin D deficiency is associated with worse diabetic neuropathy outcomes in cohort data. Repletion modestly improves symptoms in deficient adults. See vitamin D piece.

What NOT to Take

Avoid B6 above 100 mg/day — chronic high-dose B6 paradoxically causes neuropathy. Skip "nerve repair" megaformulas — many contain B6 at neurotoxic doses. Avoid kratom for neuropathic pain — opioid-like dependence and contamination risks. Avoid CBD for neuropathy — thin evidence and supply quality issues. Don't replace gabapentinoid or SNRI therapy in moderate-severe pain.

How to Run the Protocol

Confirm peripheral neuropathy with EMG/NCS where pattern is unclear. Identify and treat underlying cause. Test B12 + MMA, folate, 25-OH-D, HbA1c. Start ALA 600 mg + benfotiamine 300 mg + B12 (if deficient) + ALCAR 1 g BID. Re-evaluate symptom severity at 12 weeks. If unresolved with stable underlying-disease management, neurology referral for advanced diagnostic workup. See condition page.