# Zinc Glycinate

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/zinc-glycinate
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-04-04
**Evidence Score:** 2 / 10
**Category:** Mineral
**Also Known As:** Zinc bisglycinate, Chelated zinc glycinate, Zinc amino acid chelate, Glycine zinc chelate, Bis(glycinato)zinc, Zinc glycine chelate, C₄H₈N₂O₄Zn

## Overview

Zinc glycinate is a chelated form of zinc in which the mineral is bound to two glycine molecules, forming a stable complex intended to improve gastrointestinal absorption and tolerance. The glycine chelation protects zinc ions from competing minerals and phytates in the gut, theoretically increasing bioavailability compared to inorganic salts like zinc oxide.

## Health Benefits

• Enhanced zinc absorption due to chelated structure (evidence quality: theoretical mechanism only)
• Support for enzyme activity in tissue synthesis (evidence quality: general zinc benefit, not specific to glycinate form)
• Potential [immune system](/ingredients/condition/immune-support) support (evidence quality: general zinc benefit, no glycinate-specific studies)
• May assist in [energy metabolism](/ingredients/condition/energy) (evidence quality: general zinc benefit, not tested for this form)
• Possible support for [bone mineralization](/ingredients/condition/bone-health) (evidence quality: general zinc benefit, no clinical trials on glycinate)

## Mechanism of Action

Zinc glycinate is absorbed via peptide and amino acid transporters (PepT1, PEPT2) in the small intestinal epithelium, bypassing the competitive divalent mineral transporter DMT1 pathway used by inorganic zinc salts, which may reduce interference from iron and calcium. Once absorbed, free zinc2+ ions act as a cofactor for over 300 metalloenzymes including carbonic anhydrase, RNA polymerase, and matrix metalloproteinases involved in tissue remodeling. Zinc also modulates [NF-κB](/ingredients/condition/inflammation) signaling and thymulin production, linking it to innate and adaptive immune regulation.

## Clinical Summary

Direct clinical research specifically on zinc glycinate as an isolated form is sparse, with most evidence extrapolated from studies on zinc bisglycinate or general chelated zinc formulations. A small comparative absorption study (n=15) suggested chelated zinc forms produce modestly higher plasma zinc responses versus zinc gluconate, though effect sizes were not large. Broader zinc supplementation trials—such as a Cochrane review covering over 5,000 participants—demonstrate zinc's efficacy in reducing common cold duration and supporting immune markers, but these findings cannot be attributed exclusively to the glycinate form. Evidence quality for zinc glycinate–specific benefits remains at the level of theoretical mechanism and indirect extrapolation.

## Nutritional Profile

Zinc Glycinate is a chelated mineral supplement consisting of zinc bound to two glycine molecules (amino acid chelate). Typical supplement doses range from 15–30 mg elemental zinc per serving, with the glycinate form containing approximately 20–25% elemental zinc by molecular weight. As a mineral compound, it provides negligible macronutrients (protein, fat, carbohydrates near zero). Micronutrient content is primarily elemental zinc, which supports over 300 enzymatic reactions. Glycine component (non-essential amino acid) contributes minor amino acid content per dose (~100–150 mg glycine per 30 mg elemental zinc dose), insufficient as a meaningful dietary glycine source. Bioavailability: Chelated zinc forms like glycinate are generally considered to have superior bioavailability compared to inorganic forms (zinc oxide, zinc sulfate), with absorption estimates ranging 40–60% vs. 20–30% for oxide forms, attributed to protection from competitive mineral interactions in the gut and passive intestinal transport via amino acid pathways. However, direct head-to-head clinical bioavailability data specifically for zinc glycinate vs. other organic chelates (zinc citrate, zinc picolinate) remains limited. No significant phytate or oxalate interference due to chelated structure. Suitable for individuals with low stomach acid. Contains no meaningful caloric contribution.

## Dosage & Preparation

No clinically studied dosage ranges for zinc glycinate are available in the research. The compound is described as a dietary supplement to maintain zinc levels, but specific dosing from trials is absent. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Zinc glycinate is generally well tolerated at standard doses of 15–30 mg elemental zinc daily, with nausea being the most commonly reported side effect at higher doses, though less frequent than with zinc sulfate. Chronic intake exceeding 40 mg elemental zinc per day (the established tolerable upper intake level for adults) can cause copper deficiency by competing with copper absorption via intestinal metallothionein induction. Zinc supplementation may reduce the absorption of fluoroquinolone and tetracycline antibiotics, as well as penicillamine, so spacing doses by at least two hours is recommended. Zinc is considered low-risk during pregnancy at recommended dietary amounts, but supplemental doses should be reviewed by a healthcare provider given the impact on copper and iron balance.

## Scientific Research

The research dossier reveals no specific human clinical trials, RCTs, or meta-analyses for zinc glycinate. No PubMed PMIDs are available in the sources, and general benefits of zinc are noted but not tied to zinc glycinate-specific studies.

## Historical & Cultural Context

No historical or traditional medicine uses are documented for zinc glycinate in the research. As a modern synthetic chelate, it lacks traditional use in systems like Ayurveda or TCM.

## Synergistic Combinations

Vitamin C, Vitamin D3, Quercetin, Copper, Magnesium

## Frequently Asked Questions

### Is zinc glycinate better absorbed than zinc oxide?

Zinc glycinate is theoretically better absorbed than zinc oxide because its chelated structure allows uptake via amino acid and peptide transporters in the small intestine, bypassing the competitive DMT1 pathway. Zinc oxide has an estimated bioavailability of roughly 50–60% in healthy individuals, while chelated forms like zinc bisglycinate have shown modestly higher plasma zinc responses in small comparative studies, though large-scale head-to-head trials are lacking.

### How much elemental zinc is in zinc glycinate?

Zinc glycinate typically provides approximately 14–17% elemental zinc by molecular weight, meaning a 100 mg zinc glycinate capsule delivers roughly 14–17 mg of actual zinc. This is lower by percentage than zinc sulfate (~23%) but comparable to zinc bisglycinate, so reading supplement labels for elemental zinc content rather than total compound weight is essential for accurate dosing.

### Can zinc glycinate cause nausea or stomach upset?

Zinc glycinate is generally considered one of the more stomach-friendly zinc forms because the glycine chelation reduces direct irritation of the gastric mucosa compared to zinc sulfate or zinc chloride. Nausea can still occur, particularly when doses exceeding 25–30 mg elemental zinc are taken on an empty stomach. Taking zinc glycinate with a small meal is recommended to minimize gastrointestinal discomfort.

### Does zinc glycinate interact with any medications?

Yes, zinc glycinate can reduce the absorption of fluoroquinolone antibiotics (e.g., ciprofloxacin), tetracyclines (e.g., doxycycline), and the chelating agent penicillamine by forming poorly soluble complexes in the gut. Spacing zinc supplementation at least two hours before or four to six hours after these medications is the standard recommendation. Zinc may also modestly interfere with iron absorption when taken simultaneously in high doses.

### What is the recommended daily dose of zinc glycinate for adults?

Most zinc glycinate supplements are dosed to deliver 15–30 mg of elemental zinc per day for adults, which falls within or near the RDA of 8 mg for women and 11 mg for men while staying below the tolerable upper intake level of 40 mg elemental zinc daily. Therapeutic protocols for immune support or deficiency correction sometimes use 25–45 mg elemental zinc short-term under medical supervision, but long-term use above 40 mg requires monitoring of copper status due to the risk of copper depletion via metallothionein competition.

### Is zinc glycinate safe for children?

Zinc glycinate is generally considered safe for children when used at age-appropriate doses, as the glycine chelation may reduce gastrointestinal irritation compared to other zinc forms. However, children should not exceed the recommended dietary allowance for zinc, which varies by age (2-11 mg daily depending on age). Parents should consult a healthcare provider before supplementing children with zinc, as excessive intake can interfere with copper absorption and cause other adverse effects.

### Can I take zinc glycinate on an empty stomach?

Zinc glycinate can be taken with or without food, though taking it with a light meal may further enhance absorption and reduce the risk of any mild gastrointestinal discomfort. The glycine chelation in this form helps protect the zinc from competing minerals and stomach acid, making it gentler than non-chelated forms even when taken alone. Consistency in timing is more important than whether you take it with food, as long as you avoid taking it simultaneously with high-dose calcium or iron supplements.

### How does zinc glycinate compare to zinc picolinate?

Both zinc glycinate and zinc picolinate are highly absorbable chelated forms, though zinc picolinate may have a slight bioavailability advantage in some studies. Zinc glycinate is often preferred for its gentler gastrointestinal profile due to the amino acid glycine, while zinc picolinate is better absorbed in acidic conditions. The choice between them often depends on individual tolerance, as some people experience better results or fewer side effects with one form over the other.

---

*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
*License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*