Interactions on record — worth a quick check against your medications. Check your meds →
Dietary supplement

Glycine Powder Ingredients & Drug Interactions

by PureBulk.com

Glycine Powder label
See full label image
Powder Category: Amino Acid/protein
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 16, 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 PureBulk.com 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.

Jump to a section

Check Your Meds Against Glycine Powder by PureBulk.com

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

Pharmacist-reviewed data Checks every ingredient Answer in seconds
Prefer a human? Send your question to our licensed pharmacists — free, answered by email within 24 hours.

HelloPharmacist Scorecard of Glycine Powder by PureBulk.com

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.

This product contains 1 active ingredient: glycine, a simple amino acid your body produces naturally and also obtains from foods like meat, fish, and dairy. Glycine plays roles in muscle function, nervous system signaling, and the production of creatine and other compounds your body needs.

There are no 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's effectiveness is mixed depending on the condition. For schizophrenia, it's rated possibly effective — meaning there's some evidence it may help, though more research is needed.

For 3-phosphoglycerate dehydrogenase (3-PGDH) deficiency, ADHD, benign prostatic hyperplasia (BPH), and cystic fibrosis, there isn't enough reliable evidence in our data to say 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, so we know less about what happens with extended use over months or years. A small number of trial participants reported mild sedation (which went away after stopping), and rarely, soft stools, nausea, vomiting, upper stomach discomfort, or dry mouth — all symptoms that resolved quickly when the supplement was stopped.

Irritability, insomnia, fatigue, memory issues, headache, and sensory changes have been reported, though it's unclear whether glycine actually caused them. Pregnancy and breastfeeding safety data are not on file for glycine.

There isn't enough reliable information to know whether it's safe during pregnancy or while nursing, so talk with your doctor or pharmacist about whether it's right for you in either situation.

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.

If you take clozapine (Clozaril) for schizophrenia, check with your doctor or pharmacist before starting this supplement — adding glycine may worsen your symptoms or decrease how well the medication works. For any other medications, no interactions are documented in our data for the ingredients we have on file.

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 might interest people exploring options for schizophrenia or looking to supplement their diet with an amino acid their body already makes. If you take clozapine, you'll want to discuss this with your doctor or pharmacist first — the interaction may weaken the medication.

For pregnancy, breastfeeding, or any long-term use, confirm with your own healthcare provider that it's appropriate for your situation.

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 Jun 25, 2013.

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 PureBulk.com
Net contents 250 g; 8.82 oz.
Market status On market
Date entered into DSLD Jun 25, 2013
DSLD ID 23102
Product type Amino Acid/protein
Supplement form Powder
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years), Gluten Free, Dairy Free, Sugar 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 PureBulk.com, 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:
1000 mg
Maximum serving Sizes:
1000 mg
Servings per container
250
IngredientAmount% DV
Glycine1000 mg--

Other ingredients: None

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.
Storage

Storage: Keep dry, cool & dark

Formulation

Free of: Sugar, soy, dairy, yeast, gluten, corn and additives.

Suggested/Recommended/Usage/Directions

Directions: As a dietary supplement, take 1000mg (a scant 1/4 teaspoon) one to three times per day, depending on individual needs, or as directed by a physician.

General Statements

US Standard Measuring Spoons Spoon Size (level) milligrams 1/8 teaspoon 571 1/4 teaspoon 1142 1/2 teaspoon 2285

Precautions

Warning: This product is not intended for use by those with a serious medical condition or pregnant or lactating women.

Consult your physician before use.

Keep out of reach of children.

FDA Disclaimer Statement

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.

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

See for yourself

Glycine Powder by PureBulk.com 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 PureBulk.com

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

Serving size1000 mg Dosage formPowder Servings per container250 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

Other (inactive) ingredients: None. These complete the product’s ingredient list but are not active constituents.

Interaction report

Glycine Powder by PureBulk.com 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.

PureBulk.com

See all PureBulk.com products
Name
PureBulk.com
City
Roseburg
State
OR
ZipCode
97471
Phone Number
(541) 679-1500
Web Address
PureBulk.com
Pharmacist Counseling Corner

Glycine Powder by PureBulk.com: Common Questions

Does Glycine Powder by PureBulk.com 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, and why would I take it?
Glycine is an amino acid — a building block of protein — that your body makes and you get from foods. People supplement with it for various reasons, including potential support for schizophrenia symptoms, though the evidence is still developing. It also plays natural roles in muscle and nervous system function.
I'm taking clozapine. Can I use this product?
Not without talking to your doctor or pharmacist first. A small study showed that adding glycine to clozapine worsened schizophrenia symptoms, so there's a real concern it might decrease how well your medication works. Your healthcare provider can advise whether it's safe for you.
Are there any side effects?
Most people tolerate it well, but a small number have reported mild sedation, soft stools, nausea, vomiting, or stomach discomfort — all of which stopped when they quit taking it. Irritability, insomnia, fatigue, memory problems, headache, and sensory changes have been reported too, though it's not clear glycine caused them.
Is it safe during pregnancy or breastfeeding?
We don't have enough reliable safety data for either situation. Talk with your doctor or pharmacist to decide whether it's right for you.
How much do we know about long-term use?
Long-term safety data are limited, so we know less about what happens if you take it for months or years. Your doctor or pharmacist can help you weigh the pros and cons for your particular situation.

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

Not sure if Glycine Powder is safe with your meds?

Our pharmacists answer your medication & supplement questions — free.

Ask a pharmacist

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

Keep exploring
Supplement interaction checker › Check any supplement or product against your medications Drug–drug interactions › Check two or more of your medications against each other Browse medications A–Z › Every drug we've checked against herbs & supplements NDC & pricing lookup › Find a drug’s NDCs, packaging and costs Ask a pharmacist › Free, personal answer from our licensed team