Eczema (Atopic Dermatitis): The Evidence-Based Supplement Protocol

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Atopic dermatitis is driven by skin barrier dysfunction (filaggrin mutations) plus IL-13/IL-4-dominated type 2 inflammation. Topical corticosteroids, calcineurin inhibitors, and biologics (dupilumab) remain the strongest interventions. Supplements address the inflammatory and prevention components, with modest but real effects in carefully selected populations.

Vitamin D — Repletion to 25-OH-D 30+ ng/mL

A 2016 meta-analysis of 5 RCTs concluded vitamin D supplementation reduced SCORAD scores in adults and children with eczema versus placebo. Effect was strongest in adults starting deficient (<20 ng/mL) and in winter months. Dose to a serum target. See vitamin D dose guide.

EPA-Dominant Omega-3, 1.5–3 g Daily

Multiple RCTs of omega-3 in atopic dermatitis have shown modest reductions in SCORAD scores at 1.5–3 g EPA + DHA daily over 8–12 weeks. Effect smaller than topical corticosteroids but additive. See our omega-3 inflammation context piece.

Probiotics in Pregnancy and Infancy — Prevention Only

The strongest probiotic eczema evidence is preventive, not therapeutic. Meta-analyses including the 2015 Cochrane review showed that Lactobacillus rhamnosus GG and certain Lactobacillus + Bifidobacterium combinations given to mothers in the third trimester and continued in infants for 6 months reduced atopic dermatitis incidence by 8 years of age. Effect in adults with established eczema is much weaker. See our infant eczema probiotic piece.

Zinc — Repletion if Deficient

Zinc deficiency is more common in children with severe eczema (especially with frequent infections). Test serum zinc; supplement 15–25 mg elemental daily if low. Do not megadose — high-dose zinc does not improve eczema in non-deficient patients.

What NOT to Take

The Cochrane 2013 review concluded evening primrose oil and borage oil DO NOT help eczema — earlier positive trials had methodological problems. See our EPO Cochrane piece and borage oil piece. Skip "skin clearing detox" formulas — no mechanism. Avoid high-dose vitamin E for eczema — null data. Don't replace topical therapy with supplements alone in moderate-severe disease.

How to Run the Protocol

Topical corticosteroid for flares + bland emollient ≥twice daily is the foundation. Test 25-OH-D and zinc. Replete vitamin D to 30+ ng/mL. Add omega-3 1.5 g EPA + DHA daily for 12 weeks. For pregnant mothers with family history of atopy: probiotic in 3rd trimester + infant continuation has preventive evidence. For severe disease, biologics (dupilumab, JAK inhibitors) outperform any supplement. See the broader skin health stack.