GERD (Acid Reflux): The Evidence-Based Supplement Protocol

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GERD is dominated by mechanical (lower esophageal sphincter) and acid-suppression pharmacology. PPIs and H2 blockers remain primary. Supplements have a narrow but real adjunctive role for breakthrough symptoms, post-prandial reflux, and adults trying to step down PPI therapy.

Alginate-Antacid (Sodium Alginate), 10–20 mL After Meals

Sodium alginate (Gaviscon Advance) forms a raft of viscous gel on top of the stomach contents, mechanically blocking reflux. Multiple meta-analyses have shown alginate is more effective than placebo and at least as effective as standard antacids for symptomatic reflux. Adjunctive to PPI in moderate-to-severe disease. Not technically a "supplement" but worth including in any GERD protocol.

Melatonin, 3–6 mg at Bedtime

A 2010 RCT in 350 adults with GERD compared melatonin 6 mg nightly versus omeprazole 20 mg over 8 weeks; the melatonin arm showed comparable symptom relief on most measures. Mechanism involves LES tone modulation and esophageal anti-inflammatory effects via gut-derived melatonin. Most useful in GERD that worsens with sleep disruption. See melatonin dosing piece.

Deglycyrrhizinated Licorice (DGL), 380 mg Before Meals

DGL has been used in GERD for decades with modest trial support — pooled evidence is smaller than for PPIs but the safety profile is clean (with the glycyrrhizin removed). See DGL piece.

STW5 (Iberogast)

STW5 has positive trial data in functional dyspepsia overlap and in dyspeptic GERD presentations. Reasonable adjunct.

Magnesium — For PPI-Associated Hypomagnesemia

Long-term PPI therapy is associated with hypomagnesemia in a meaningful subset of adults. Annual serum magnesium testing in adults on PPIs >12 months. Supplement to repletion as needed.

What NOT to Take

Avoid peppermint oil — it relaxes the lower esophageal sphincter and can WORSEN reflux (different from its IBS benefit). Skip apple cider vinegar — null evidence and the acid load contradicts any reasonable mechanism. Avoid baking soda chronically — sodium overload, alkalosis risk. Skip "stomach soothing" megaherb formulas — many include peppermint which makes GERD worse. Don't replace PPI in Barrett's esophagus or biopsy-proven esophagitis with supplements alone.

How to Run the Protocol

Lifestyle first: weight loss if obese, head-of-bed elevation, no eating within 3 hours of sleep, smoking cessation. PPI therapy at lowest effective dose; some patients can step down to H2 blocker or as-needed. Layer alginate-antacid after evening meal + melatonin 3 mg at bedtime as adjuncts. Use DGL before trigger meals. Re-evaluate symptoms at 8 weeks. Endoscopy if symptoms persist on PPI to rule out Barrett's or eosinophilic esophagitis. See condition page.