Supplements and diabetes medications
9 documented interactions9 supplements1 major
Read this first. This page is educational reference material, not medical advice, and it is not a substitute for a pharmacist’s review of your own medication list. It cannot know your kidney function, your doses, your other prescriptions, or why you were put on them. Bring the actual bottle to the pharmacist who fills your prescriptions, or to your prescriber, before you start or stop anything. In an emergency call 911 (US) or your local emergency number.
Metformin, sulfonylureas, insulin, SGLT2 inhibitors and GLP-1 agonists all lower blood glucose. A supplement that also lowers glucose does not replace them — it stacks on top of them, and the practical risk is a low, not a high.
Below is every interaction Magellan documents for this class — 9 entries across 9 supplements, each with the mechanism as the cited reference states it, how serious that reference treats it, and where to take the question next.
Check your own listMagellan’s Medication Safety Check runs entirely on your device — type the medicines you take and it flags every documented interaction in this dataset. Nothing you type is sent anywhere.
Open the Medication Safety Check → Every documented interaction in this class
Major Diabetes medications (metformin, sulfonylureas, insulin, and other glucose-lowering drugs)
Documented for Berberine
Direction of the risk: Additive — pushes in the same direction as the medicine, so the combined effect can overshoot.Berberine independently lowers blood glucose through mechanisms that overlap with metformin's; combined with diabetes medications it can cause additive or excessive blood-sugar lowering, and should not be substituted for prescribed diabetes therapy without medical supervision.
Source: Berberine: What It Is, Benefits & Side Effects ↗
What to do: Ask your prescriber before starting, and check your glucose more often for the first one to two weeks. Never lower or stop a prescribed diabetes medicine to “make room” for a supplement — dose changes are a prescriber decision.
Moderate Insulin and other diabetes medications
Documented for CoQ10 / ubiquinol
NCCIH notes CoQ10 may interact with the diabetes drug insulin, which could affect blood sugar control.
Source: Coenzyme Q10 | NCCIH ↗
What to do: Ask your prescriber before starting, and check your glucose more often for the first one to two weeks. Never lower or stop a prescribed diabetes medicine to “make room” for a supplement — dose changes are a prescriber decision.
Minor Diabetes medications / insulin
Documented for Olive leaf extract (oleuropein)
Direction of the risk: Additive — pushes in the same direction as the medicine, so the combined effect can overshoot.Laboratory experiments show olive leaf extract can lower blood sugar levels, which could add to the effect of glucose-lowering medications; clinical significance in humans has not yet been established.
Source: Olive Leaf | Memorial Sloan Kettering Cancer Center ↗
What to do: Ask your prescriber before starting, and check your glucose more often for the first one to two weeks. Never lower or stop a prescribed diabetes medicine to “make room” for a supplement — dose changes are a prescriber decision.
Moderate Diabetes medications (insulin, sulfonylureas, etc.)
Documented for Saffron extract
Direction of the risk: Additive — pushes in the same direction as the medicine, so the combined effect can overshoot.Saffron may lower blood sugar; taking it with diabetes medications could increase the risk of hypoglycemia.
Source: Saffron: Overview, Uses, Side Effects, Precautions, Interactions, Dosing and Reviews ↗
What to do: Ask your prescriber before starting, and check your glucose more often for the first one to two weeks. Never lower or stop a prescribed diabetes medicine to “make room” for a supplement — dose changes are a prescriber decision.
Moderate Diabetes medications / insulin
Documented for Alpha-lipoic acid (ALA)
Direction of the risk: Additive — pushes in the same direction as the medicine, so the combined effect can overshoot.Alpha-lipoic acid can lower blood sugar; combined with diabetes medication this may add to the glucose-lowering effect and raise hypoglycemia risk.
Source: Diabetic neuropathy: Can dietary supplements help? - Mayo Clinic ↗
What to do: Ask your prescriber before starting, and check your glucose more often for the first one to two weeks. Never lower or stop a prescribed diabetes medicine to “make room” for a supplement — dose changes are a prescriber decision.
Moderate Diabetes medications / insulin
Documented for Glucosamine and chondroitin — specifically Osteo Bi-Flex Triple Strength (Glucosamine Chondroitin + Joint Shield) and Glucosamine Chondroitin MSM (with OptiMSM)
Direction of the risk: Opposing — may work against what the medicine was prescribed to do, which is a different (and easily missed) danger from an additive one.Glucosamine may worsen insulin resistance and reduce glucose tolerance, potentially interfering with blood sugar control in patients on diabetes medication.
Source: Glucosamine ↗
What to do: Ask your prescriber before starting, and check your glucose more often for the first one to two weeks. Never lower or stop a prescribed diabetes medicine to “make room” for a supplement — dose changes are a prescriber decision.
Moderate Diabetes medications/insulin
Documented for Inulin prebiotic fibre
Direction of the risk: Additive — pushes in the same direction as the medicine, so the combined effect can overshoot.Fiber supplements, including inulin, can lower blood sugar levels; combined with diabetes medications this may require dose adjustment to avoid hypoglycemia, and patients should discuss this with their care team.
Source: Fiber supplements: Safe to take every day? - Mayo Clinic ↗
What to do: Ask your prescriber before starting, and check your glucose more often for the first one to two weeks. Never lower or stop a prescribed diabetes medicine to “make room” for a supplement — dose changes are a prescriber decision.
Moderate Insulin and other diabetes medications (via ginger)
Documented for NOVOS Core (multi-ingredient formula)
Direction of the risk: Additive — pushes in the same direction as the medicine, so the combined effect can overshoot.Ginger may cause additive blood-glucose-lowering effects with insulin or oral glucose-lowering medications; clinical relevance in humans is not fully established but caution and glucose monitoring are reasonable.
Source: Ginger ↗
What to do: Ask your prescriber before starting, and check your glucose more often for the first one to two weeks. Never lower or stop a prescribed diabetes medicine to “make room” for a supplement — dose changes are a prescriber decision.
Minor Insulin and other glucose-lowering medications (via apple cider vinegar component)
Documented for NOVOS Vital Organ Support
Direction of the risk: Additive — pushes in the same direction as the medicine, so the combined effect can overshoot.Apple cider vinegar can lower fasting and post-meal blood glucose and slow gastric emptying; combined with diabetes medication this could theoretically add to blood-sugar-lowering effects, though evidence is limited.
Source: Apple Cider Vinegar - Metformin XR Interaction Details ↗
What to do: Ask your prescriber before starting, and check your glucose more often for the first one to two weeks. Never lower or stop a prescribed diabetes medicine to “make room” for a supplement — dose changes are a prescriber decision.
Which drugs are in this class
Medicines in this group include: Metformin (Glucophage, Fortamet), Insulin (Humalog, Novolog), Glipizide (Glucotrol), Glyburide (Diabeta, Glynase), Glimepiride (Amaryl), Sitagliptin (Januvia), Empagliflozin (Jardiance), Dapagliflozin (Farxiga), Canagliflozin (Invokana), Semaglutide (Ozempic, Wegovy), Liraglutide (Victoza, Saxenda), Tirzepatide (Mounjaro, Zepbound), Pioglitazone (Actos).
Brand names are listed in brackets after the generic ingredient. If the name on your bottle is not here, the generic name on the label almost always is — and the Medication Safety Check accepts either.
When to seek care urgently
These are the warning signs that go with the medication classes on this page. They are general safety-netting, not a prediction that any supplement will cause them.
- Shakiness, sweating, confusion, slurred speech, or fainting can signal low blood sugar. Treat immediately with fast-acting sugar and get help; repeated lows mean the medication plan needs review, not a supplement adjustment.
If something feels seriously wrong, do not wait for an appointment. Call 911 (US) or your local emergency number.
How to read a severity label
- Major — the source describes a clinically significant risk — treat this as a combination to clear with a clinician before you start, not after.
- Moderate — a real, documented interaction that usually calls for monitoring, separating the doses, or a prescriber-led dose change.
- Minor — documented but usually low-impact, or based on mechanism and animal data rather than human events — still worth naming to your pharmacist.
Severity describes the interaction as the cited reference frames it, not how a specific person will react. A “minor” entry in someone with kidney disease, on five other drugs, can matter more than a “major” one in someone on nothing else.
What this page does not tell you
This is a curated set of interactions with citations — not an exhaustive pharmacology database. An interaction that is absent here has not been ruled out; it may simply not be documented in the references Magellan curates from. Supplements are also not batch-tested for identity or contamination the way prescription drugs are, so what is on the label is a claim rather than a guarantee. And most of these entries come from case reports and mechanistic work rather than randomized trials, which is exactly why the sensible response is a pharmacist review rather than either alarm or dismissal.
Supplements documented in this class
Questions people actually ask
Which supplements interact with diabetes medications?
Berberine, CoQ10 / ubiquinol, Olive leaf extract (oleuropein), Saffron extract, Alpha-lipoic acid (ALA), Glucosamine and chondroitin, Inulin prebiotic fibre, NOVOS Core (multi-ingredient formula), NOVOS Vital Organ Support — 9 documented entries in total (1 major, 6 moderate, 2 minor). Each entry on this page names the reference it came from.
Which drugs count as diabetes medications?
In this dataset the class includes Metformin, Insulin, Glipizide, Glyburide, Glimepiride, Sitagliptin and others. Brand names are mapped to their generic ingredient inside the Medication Safety Check, so typing the name on your bottle works.
Does an interaction mean I have to stop the supplement?
Usually not. Most entries here call for one of three things: separating the doses by a few hours, monitoring a lab value or a home reading for a couple of weeks, or a prescriber-led dose adjustment. The decision belongs to the clinician who manages the prescription — what this page is for is making sure the conversation happens before you start rather than after something goes wrong.
Who compiles this. Magellan Longevity is written and edited by Gabriel Radu, DO — a physiatrist (New York license 275110, NPI 1376861765). Interaction entries are curated from clinical references — the NIH Office of Dietary Supplements, NCCIH, MedlinePlus, Mayo Clinic and Memorial Sloan Kettering’s About Herbs among them — and every entry links to the reference it came from so you can check it yourself. Magellan earns affiliate commission on some products; nothing on a safety page is softened, delayed, or omitted because of it. Where a supplement we sell carries a major documented interaction, that is the first thing on the page.