Drug & supplement interaction

Alpha-lipoic Acid + Glipizide, Metformin

Glipizide, Metformin brand name: Metaglip.

Minor Interaction
Medically reviewed by · Updated September 2026
The bottom line Minor

Alpha-lipoic Acid has a minor interaction with Glipizide, Metformin. Theoretically, taking alpha-lipoic acid with antidiabetes drugs might increase the risk of hypoglycemia.

Read the full interaction report
SeverityMinor
LikelihoodUnlikely
EvidenceB
What do Severity, Likelihood & Evidence mean?
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Interaction report

Alpha-lipoic Acid and Glipizide, Metformin

Here is the interaction we found between these two, with the evidence behind it.

Minor

ANTIDIABETES DRUGS

Why this applies to Glipizide, Metformin

Glipizide, Metformin falls under ANTIDIABETES DRUGS — the group Alpha-lipoic Acid interacts with.

Theoretically, taking alpha-lipoic acid with antidiabetes drugs might increase the risk of hypoglycemia.
Although some small clinical studies have suggested that alpha-lipoic acid can lower blood glucose levels, larger clinical studies in patients with diabetes have shown no clinically meaningful effect. Additionally, co-administration of single doses of alpha-lipoic acid and glyburide or acarbose did not cause detectable drug interactions in healthy volunteers.
Severity Minor Likelihood Unlikely Evidence B

Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans..

Dr. Brian Staiger, PharmD, BCPS
Dr. Brian Staiger explains PharmD, Clinical Pharmacist

Here's the gist with Metaglip, which combines glipizide and metformin. Alpha-lipoic acid may, in theory, nudge your blood sugar a little lower on its own. Pair it with these two diabetes medicines (especially glipizide, which can already cause low blood sugar) and there's a chance the effects add up, pushing you toward hypoglycemia. That can show up as shakiness, sweating, dizziness, a fast heartbeat, or feeling confused or unusually hungry.

The good news: this is mostly a theoretical concern. Larger studies in people with diabetes didn't find a meaningful blood sugar drop from ALA, and it isn't a prodrug situation here. Still, if you take both, keep an eye on your readings and check with your pharmacist or doctor before starting.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Konrad T, Vicini P, Kusterer K, et al. Alpha-lipoic acid treatment decreases serum lactate and pyruvate concentrations and improves glucose effectiveness in lean and obese patients with Type 2 diabetes. Diabetes Care 1999;22:280-7. PubMed
  2. Gleiter CH, Schreeb KH, Freudenthaler S, et al. Lack of interaction between thioctic acid, glibenclamide and acarbose. Br J Clin Pharmacol 1999;48:819-25. PubMed
  3. Jacob S, Henriksen EJ, Tritschler HJ, et al. Improvement of insulin-stimulated glucose-disposal in type 2 diabetes after repeated parenteral administration of thioctic acid. Exp Clin Endocrinol Diabet 1996;104:284-8. PubMed
  4. Jacob S, Henriksen EJ, Schiemann AL, et al. Enhancement of glucose disposal in patients with type 2 diabetes by alpha-lipoic acid. Arzneimittelforschung 1995;45:872-4.
  5. Jacob S, Ruus P, Hermann R, et al. Oral administration of RAC-alpha-lipoic acid modulates insulin sensitivity in patients with type-2 diabetes mellitus: a placebo-controlled, pilot trial. Free Rad Biol Med 1999;27:309-14.
  6. Porasuphatana S., Suddee S., Nartnampong A., Konsil J., Harnwong B., Santaweesuk A. Glycemic and oxidative status of patients with type 2 diabetes mellitus following oral administration of alpha-lipoic acid: a randomized double-blinded placebo-controlled
  7. Ansar H., Mazloom Z., Kazemi F., Hejazi N. Effect of alpha-lipoic acid on blood glucose, insulin resistance and glutathione peroxidase of type 2 diabetic patients. Saudi Med J 2011;32(6):584-588. DOI
  8. de Oliveira A. M., Rondó P. H., Luzia L. A., D'Abronzo F. H., Illison V. K. The effects of lipoic acid and a-tocopherol supplementation on the lipid profile and insulin sensitivity of patients with type 2 diabetes mellitus: a randomized, double-blind, pla
  9. Mazloom Z., Ansar H. The Effect of Alpha-Lipoic Acid on Blood Pressure in Type 2 Diabetics. Iranian Journal of Endocrinology and Metabolism 2009;11(3):245-250.
  10. Volchegorskii I. A., Rassokhina L. M., Koliadich M. I., Alekseev M. I. [Comparative study of alpha-lipoic acid and mexidol effects on affective status, cognitive functions and quality of life in diabetes mellitus patients]. Eksp Klin Farmakol 2011;74(11):
  11. Hegazy SK, Tolba OA, Mostafa TM, Eid MA, El-Afify DR. Alpha-lipoic acid improves subclinical left ventricular dysfunction in asymptomatic patients with type 1 diabetes. Rev Diabet Stud 2013;10(1):58-67. PubMed
  12. Huang Z, Wan X, Liu J, et al. Short-term continuous subcutaneous insulin infusion combined with insulin sensitizers rosiglitazone, metformin, or antioxidant a-lipoic acid in patients with newly diagnosed type 2 diabetes mellitus. Diabetes Technol Ther 201
  13. Derosa G, D'Angelo A, Preti P, Maffioli P. Safety and efficacy of alpha lipoic acid during 4 years of observation: A retrospective, clinical trial in healthy subjects in primary prevention. Drug Des Devel Ther. 2020;14:5367-5374.
  14. Jibril AT, Jayedi A, Shab-Bidar S. Efficacy and safety of oral alpha-lipoic acid supplementation for type 2 diabetes management: a systematic review and dose-response meta-analysis of randomized trials. Endocr Connect 2022;11(10):e220322. PubMed

What These Ratings Mean

Every interaction above is graded three ways — here’s the key to each label.

Severity how clinically significant the interaction is
Major

Clinically significant. Avoid the combination, or use only under close professional supervision.

Moderate

Usually worth avoiding or managing — may need monitoring, a dose change, or timing apart.

Minor

Generally not serious. Be aware of it and mention it to your pharmacist.

Likelihood how strong the evidence is that the interaction actually happens in people
  • LikelyWell-controlled human studies have demonstrated the likely existence of this interaction.
  • ProbableInteraction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
  • PossibleInteraction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists.
  • UnlikelyInteraction has been demonstrated in animal or in lab research but has been shown not to occur in humans.
Evidence the quality of the studies behind the rating (graded A–D)
  • AHigh-quality meta-analysis (quantitative systematic review).
  • BCase-control study.
  • CConsensus.
  • DAnecdotal evidence.

These ratings are for information only. Never start, stop, or otherwise change your therapy before speaking with your provider.

Keep it in perspective

Alpha-lipoic Acid Also Interacts With Other Medications

Alpha-lipoic Acid has 177 moderate, 85 minor known drug interactions in our database — the Glipizide, Metformin one above is one of them. If you take anything else, check it against the full list below.

Moderate 177 Minor 85 No known interaction 2,568 (incl. Glipizide, Metformin)
Taking anything else?

Check Another of Your Medications Against Alpha-lipoic Acid

Covers the 2,830 medications we’ve checked against Alpha-lipoic Acid. Pick one to open its full report.

Everything else you take

See Every Supplement That Interacts With Glipizide, Metformin

This page covers Alpha-lipoic Acid only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Glipizide, Metformin page lists 307 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Siberian Cocklebur (major), Acai (moderate), Adrafinil (moderate) and African Wild Potato (moderate).

By severity: 2 major · 257 moderate · 48 minor.

From our pharmacist’s overview on the Glipizide, Metformin page

“Glipizide and metformin (Metaglip) already work hard to pull blood sugar down, which is exactly why this list of 307 ingredients deserves genuine vigilance rather than a shrug. Most of them, 239, can lower glucose on their own, and stacked on this pill the combined effect can tip into true hypoglycemia.”

Reviewed by 2 · Jul 18, 2026

Open the Glipizide, Metformin interaction page

One more smart check

Taking Alpha-lipoic Acid as Part of a Dietary Supplement Product? Check It for Interactions

We hold 4,223 real supplement products containing Alpha-lipoic Acid, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Alpha-lipoic Acid. Your product may carry other ingredients that interact with Glipizide, Metformin too, on top of Alpha-lipoic Acid — and those would not show on this page. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Alpha-lipoic Acid and Glipizide, Metformin Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement Alpha-lipoic Acid
Top 5%

#34 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Glipizide, Metformin
Steady interest

#1,779 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Supplement

About Alpha-lipoic Acid

What is Alpha-lipoic Acid?

Alpha-lipoic Acid
  • Diabetic nerve pain (neuropathy)
  • Blood sugar support in diabetes
  • Antioxidant support
  • Liver health
  • Skin aging (topical and oral)

Alpha-lipoic acid (ALA) is an antioxidant made naturally by the body and found in small amounts in foods. It is most studied for diabetic nerve pain, where some evidence suggests it may help, but evidence for most other uses is limited. It is generally well tolerated, but talk to your pharmacist or doctor before using it, especially if you have diabetes or thyroid problems.

Read the full Alpha-lipoic Acid monograph & all interactions
Keep checking

Other Drugs & Alpha-lipoic Acid

Browse every other medication we’ve checked against Alpha-lipoic Acid — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
177Moderate
85Minor
2,567No known interaction
177 Moderate 85 Minor 2,567 No interaction
Moderate

177 interactions

Showing 60 of 177 moderate interactions — see all 177 on the Alpha-lipoic Acid page.

Minor

85 interactions

Showing 60 of 85 minor interactions — see all 85 on the Alpha-lipoic Acid page.

No interaction 2,567 drugs checked — show the list

We also checked Alpha-lipoic Acid against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,567 medications checked with no known interaction — see the full Alpha-lipoic Acid list.

See the full Alpha-lipoic Acid interactions page
See every supplement checked against Glipizide, Metformin, ranked by severity
Sources

Sources & How We Checked

Interaction details are evidence-graded and sourced from the Natural Medicines database. The medication overview comes from MedlinePlus.

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

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
Alpha-lipoic Acid monograph › Uses, safety, and every drug interaction in one place Glipizide, Metformin supplement interactions › Every supplement checked against Glipizide, Metformin, ranked by severity Supplement interaction checker › Check any supplement or product against your medications Browse medications A–Z › Every drug we've checked against herbs & supplements Ask a pharmacist › Free, personal answer from our licensed team
Pharmacist Counseling Corner

Taking Alpha-lipoic Acid and Glipizide, Metformin Together: Common Questions

Can you take Alpha-lipoic Acid with Glipizide, Metformin?
There is only a minor interaction, which is usually not serious. Read the full details on this page and confirm with your pharmacist before combining them.
How serious is the Alpha-lipoic Acid and Glipizide, Metformin interaction?
We rate it Minor. This interaction is generally not clinically significant, but it remains worth noting and discussing with your pharmacist.

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

Still Have a Question About Glipizide, Metformin and Alpha-lipoic Acid?

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This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.