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Drug Nutrient Depletion Guide

H2 Blockers (Acid Reducers): What It Depletes and How to Replenish

H2 Blockers (Acid Reducers) (Pepcid (Famotidine), Zantac (Ranitidine), Tagamet) is associated with clinically documented depletion of 2 key nutrients. Below you'll find the mechanism, clinical evidence, and evidence-based replenishment protocols for each.

This page is educational content based on published clinical trials. All supplement recommendations should be discussed with your prescribing physician before implementation. Evidence ratings follow the same RCT-first methodology used across the full Evidence Based Longevity database.
2 Documented Depletions · RCT Evidence
1
Vitamin B12
Moderate Depletion Risk
How It Depletes

H2 blockers reduce gastric acid, impacting food-bound B12 absorption (though less severely than PPIs).

Clinical Evidence

Marcuard et al. (1994) — significant B12 malabsorption with H2 blocker use

Symptoms of Deficiency

Fatigue, cognitive changes, elevated homocysteine with long-term use

Evidence-Based Replenishment

Methylcobalamin 500–1,000mcg sublingual if using H2 blockers daily for 1+ years.

View on Fullscript: Thorne Methylcobalamin 1mg

Discuss with your physician before adjusting supplementation. This is educational content, not medical advice.

2
Zinc
Moderate Depletion Risk
How It Depletes

Reduced gastric acid from H2 blockade impairs zinc ionization and absorption.

Clinical Evidence

Sturniolo et al. (1991) — zinc malabsorption with acid suppression

Symptoms of Deficiency

Immune suppression, taste changes, skin issues

Evidence-Based Replenishment

Zinc bisglycinate 15mg daily with food.

View on Fullscript: Thorne Zinc Picolinate 15mg

Discuss with your physician before adjusting supplementation. This is educational content, not medical advice.

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