Neuropathic Pain: The Evidence-Based Supplement Protocol

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Neuropathic pain spans diabetic neuropathy, post-herpetic neuralgia, chemotherapy-induced peripheral neuropathy, and other nerve-injury syndromes. Pharmacotherapy (gabapentinoids, SNRIs, tricyclics, topical agents) remains first-line. Several supplements have credible RCT evidence as adjuncts, with the strongest data in diabetic peripheral neuropathy.

Alpha-Lipoic Acid (ALA), 600 mg Daily

ALA has European regulatory approval for diabetic neuropathy at 600 mg IV and oral. The SYDNEY 2 trial in 181 adults with diabetic neuropathy showed ALA 600 mg/day for 5 weeks reduced Total Symptom Score and Neuropathy Impairment Score versus placebo. The NATHAN 1 trial extended this to 4 years showing improvements on Neuropathy Impairment Score Lower Limbs. Take fasted (food halves absorption). See our ALA piece.

Benfotiamine, 300–600 mg Daily

Benfotiamine is a fat-soluble thiamine derivative with substantially better tissue penetration than standard thiamine HCl. Multiple German RCTs in diabetic neuropathy show benfotiamine reduces neuropathic pain scores and improves vibration perception thresholds. See fat-soluble thiamine piece.

Vitamin B12 — Repletion in Deficiency

Metformin-induced B12 deficiency contributes to a meaningful fraction of diabetic neuropathy cases. Annual B12 + MMA in adults on metformin. Replete with hydroxocobalamin IM or high-dose oral. See B12 form piece.

Palmitoylethanolamide (PEA), 600 mg Twice Daily

PEA is an endogenous fatty acid amide with anti-inflammatory and analgesic effects via PPAR-α and mast cell modulation. Multiple Italian RCTs in sciatic neuropathic pain and diabetic neuropathy show co-micronised PEA (m-PEA) reduces pain VAS scores versus placebo. See our PEA piece.

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

Acetyl-L-carnitine has positive RCT evidence in chemotherapy-induced peripheral neuropathy (paclitaxel and cisplatin specifically) and in diabetic neuropathy. Effect modest but consistent. See ALCAR vs LCAR piece.

What NOT to Take

Avoid high-dose B6 — chronic intake above 100 mg/day causes peripheral neuropathy (paradoxical). Skip "nerve support" megavitamin formulas with subclinical doses of 10+ ingredients. Avoid kava — hepatotoxicity. Don't replace gabapentinoid or SNRI therapy with supplements alone in moderate-severe pain.

How to Run the Protocol

Identify and treat underlying cause — glycemic control in diabetes is foundational. Test B12 + MMA, particularly in metformin users. Start ALA 600 mg + benfotiamine 300 mg + B12 (if deficient) for 12 weeks. Add PEA or ALCAR if pain remains. Re-evaluate at 12 weeks. See peripheral neuropathy page and the related prediabetes stack.