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Dietary supplement

Glycine Powder Ingredients & Drug Interactions

by Metabolic Maintenance

Glycine Powder label
See full label image
Powder Category: Amino Acid/protein
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 9, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Glycine Powder against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.

Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy

The interaction bottom line Most serious interaction: Moderate

Glycine Powder is a dietary supplement by Metabolic Maintenance with 1 active ingredient. Its ingredients are commonly taken for sleep quality and insomnia, relaxation, cognitive function.Based on those ingredients, 1 medication has a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Glycine. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Glycine Powder by Metabolic Maintenance

Ask about any prescription or over-the-counter medication and we check it for interactions with Glycine Powder by Metabolic Maintenance — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Glycine Powder by Metabolic Maintenance

Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Aug 6, 2026

What’s inside

Full disclosure
Ingredient Transparency · database check
Full

Every active ingredient lists its own amount on the label.

Why this rating?
  • The label discloses an exact amount for 1 of its 1 active ingredient.
  • No proprietary blends here — you can verify the dose of every single component.

Metabolic Maintenance Glycine Powder contains one active ingredient: glycine, a simple amino acid your body uses for various functions including protein synthesis and neurotransmitter support. This is a pure powder formulation with no inactive fillers or other ingredients listed.

Does it work?

Moderate evidence
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed

This product doesn't appear to be marketed for a specific use, so we graded Glycine's overall clinical evidence instead.

Moderate

Some clinical evidence supports Glycine for:

Why this rating?
  • We looked at the product name, claims, and label statements and couldn't find a stated purpose to grade.
  • Since the label doesn't commit to one use, we graded the ingredient's overall clinical evidence instead.
  • On file: Schizophrenia — rated "Possibly Effective" (Natural Medicines).

The evidence for glycine is mixed. It's rated possibly effective for schizophrenia, though the interaction data above suggests caution with clozapine specifically.

For other uses listed—3-phosphoglycerate dehydrogenase deficiency, ADHD, benign prostatic hyperplasia, and cystic fibrosis—we don't have enough reliable evidence to know whether it works.

The evidence, ingredient by ingredient Glycine

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 1 of the 1 matched ingredient.
  • Pregnancy & breastfeeding safety ratings cover 1 of 1.
  • General safety write-ups exist for 1 of 1.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Glycine is generally well tolerated at typical doses, but long-term safety data are limited. Mild sedation has been reported rarely and resolves quickly when you stop taking it.

Gastrointestinal symptoms like soft stools, nausea, vomiting, and upper GI discomfort occur rarely and also resolve when discontinued. Other symptoms including irritability, insomnia, fatigue, memory problems, headache, dry mouth, and sensory changes have been reported, though it's unclear whether glycine actually caused them.

There isn't enough reliable safety data for pregnancy or breastfeeding, so discuss use with your doctor or pharmacist before taking it during either.

Side effects, ingredient by ingredient Glycine

Meds to double-check

Moderate interaction found
Known Interaction Concern · database check
Moderate identified

The most serious documented interaction for these ingredients is Moderate. Check your medications for a personalized result.

Why this rating?
  • 1 of the 1 matched ingredient can interact with medications — Glycine.
  • The most serious interaction on file is rated Moderate.
  • For scale: 1 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

The one medication you should double-check before taking this product is clozapine (Clozaril). A moderate interaction has been documented showing glycine may reduce clozapine's effectiveness.

If you take clozapine, confirm with your doctor or pharmacist before adding this supplement.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with some supporting evidence behind its ingredients' uses. Moderate medication interactions have been identified, and safety information is well characterized.

Glycine powder is a straightforward single-ingredient supplement generally well tolerated at standard doses. If you take clozapine for schizophrenia, check with your doctor or pharmacist before starting—the evidence suggests it may make your medication less effective.

If you're pregnant, breastfeeding, or take any psychiatric medications, talk it over with your healthcare provider first.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Sep 22, 2022.

This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed

At a glance

General information

Key facts about Glycine Powder, straight from the product label.

Brand Metabolic Maintenance
Barcode (UPC) 838287001201
Net contents 200 Gram(s); 7 Ounce(s)
Market status On market
Date entered into DSLD Sep 22, 2022
DSLD ID 274041
Product type Amino Acid/protein
Supplement form Powder
Dietary claims / uses All Other
Intended target group(s) Adult (18 - 50 Years), Gluten Free, Dairy Free
From the label
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.

Supplement Facts

The label details for Glycine Powder by Metabolic Maintenance, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
0.25 tsp
Maximum serving Sizes:
0.25 tsp
Servings per container
200
UPC/BARCODE
838287001201
IngredientAmount% DV
Glycine1000 mg--

Tap any ingredient to jump to its full detail below.

Label statements
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Precautions

Caution: Pregnant or lactating women, consult your healthcare professional before taking this product.

Keep tightly closed in a cool, dry place, out of the reach of children.

Discontinue if diarrhea occurs.

Storage

Keep tightly closed in a cool, dry place, out of the reach of children.

Formulation

Egg free Gluten free Free of nuts Dairy free

Manufactured in a GMP Compliant Facility

FDA Statement of Identity

Dietary Supplement

Suggested/Recommended/Usage/Directions

Directions: 1 scoop (1/4 teaspoon, 1000 mg) in 10 oz of liquid as a nutritional sweetener.

Pure Glycine Powder may be easily combined with water, fruit juice or other liquids.

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Glycine Powder by Metabolic Maintenance label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

Glycine Powder label

Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.

View the full label (PDF)
What’s inside

The Ingredients in Glycine Powder by Metabolic Maintenance

This is the 1 active ingredient this product is made of. Select it to open its full monograph.

Serving size0.25 tsp Dosage formPowder Servings per container200 Amounts shown are per serving.

Glycine

Interacts with
1 drug
1000 mg per serving

Glycine is a non-essential amino acid your body makes on its own and that also appears in protein-rich foods. It is most studied for improving sleep q...

Glycine monograph & interactions
Interaction report

Glycine Powder by Metabolic Maintenance Drug Interactions

Want to check YOUR meds against Glycine Powder?

Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.

 Go to the checker
1Drugs
1 Moderate

Ingredients driving the most interactions

Glycine 1

Individual Drug Interactions

The ingredients in Glycine Powder interact with 1 drug. Click any drug to see the details.

1 of the 1 ingredient in Glycine Powder interact with drugs. Each result below shows which ingredient is responsible. Glycine

Each ingredient & the kinds of drugs it affects

For each ingredient in Glycine Powder with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.

Glycine1 drug type · 1 drug

Clozapine (Clozaril)

Theoretically, glycine might decrease the effectiveness of clozapine.
One small clinical study in patients with schizophrenia shows that adding glycine to clozapine therapy worsens symptoms of schizophrenia when compared with clozapine alone. The mechanism of this interaction is unclear.

Likelihood Probable Evidence B
Glycine full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Glycine Powder, from the product label.

Metabolic Maintenance

See all Metabolic Maintenance products
Name
Metabolic Maintenance
Street Address
601 N Larch Street
City
Sisters
State
Oregon
ZipCode
97759
Phone Number
800-772-7873
Web Address
MetabolicMaintenance.com
Pharmacist Counseling Corner

Glycine Powder by Metabolic Maintenance: Common Questions

Does Glycine Powder by Metabolic Maintenance interact with any medications?
Yes. Based on its ingredients, Glycine Powder has a known interaction with 1 medication. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Glycine Powder contains a single active ingredient, and that one ingredient can interact with many different medications on its own. We check it against each medication and show the mechanism responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
What is glycine used for?
Glycine is an amino acid with possibly effective evidence for schizophrenia support. It's also been studied for ADHD, benign prostatic hyperplasia, cystic fibrosis, and rare enzyme deficiencies, though we don't have enough evidence to say whether it works for those yet.
Are there side effects?
Mild sedation has occurred rarely and goes away when you stop. Gastrointestinal symptoms like soft stools, nausea, or vomiting are rare and also resolve quickly. Other symptoms like irritability, insomnia, or headache have been reported, though it's unclear if glycine caused them.
Is it safe to take while pregnant or breastfeeding?
There isn't enough reliable safety data for either pregnancy or breastfeeding. Talk with your doctor or pharmacist about whether it's right for you before using it during either time.
Is this pure glycine with nothing else?
Yes—it's just glycine powder with no inactive fillers or other ingredients added.
How long is it safe to take?
Long-term safety data are limited. While glycine is generally well tolerated at typical doses, discuss duration and ongoing use with your doctor or pharmacist.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

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Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.

Glycine Powder label
Go deeper

The Full Monographs Behind Glycine Powder’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Glycine

Interacts with 1 drug

Glycine is a non-essential amino acid your body makes on its own and that also appears in protein-rich foods. It is most studied for improving sleep quality, where early research is promisin...

Read the full Glycine monograph →
Sources

Sources & How We Checked

Glycine Powder's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

The 5 references behind this product’s interaction data

Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.

Glycine 5 references
  1. Heresco-Levy U, Javitt DC, Ermilov M, et al. Efficacy of high-dose glycine in the treatment of enduring negative symptoms of schizophrenia. Arch Gen Psychiatry 1999;56:29-36.. PubMed
  2. Potkin SG, Jin Y, Bunney BG, Costa J, Gulasekaram B. Effect of clozapine and adjunctive high-dose glycine in treatment-resistant schizophrenia. Am J Psychiatry 1999;156:145-7.. PubMed
  3. Gusev EI, Skvortsova VI, Dambinova SA, et al. Neuroprotective effects of glycine for therapy of acute ischaemic stroke. Cerebrovasc Dis 2000;10:49-60. PubMed
  4. Inagawa K, Kawai N, Ono K, Sukegawa E, Tsubuku S, Takahashi M. Assessment of acute adverse effects of glycine ingestion at a high dose in human volunteers. Seikatsu Eisei. 2006; 50:27-32.
  5. Woods SW, Walsh BC, Hawkins KA, Miller TJ, Saksa JR, D'Souza DC, Pearlson GD, Javitt DC, McGlashan TH, Krystal JH. Glycine treatment of the risk syndrome for psychosis: report of two pilot studies. Eur Neuropsychopharmacol. 2013 Aug;23(8):931-40. PubMed

See these in context on the Glycine monograph →

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

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