Guide: medicines
Blood Sugar Supplements with Metformin or Insulin: Interactions, Lows and What to Ask
Blood sugar supplements with metformin, insulin or a sulfonylurea need a doctor's or pharmacist's OK first. The ADA warns that some supplements can push glucose too low alongside diabetes drugs, and chromium may add to insulin's effect. For many people a low is under 70 mg/dL: take 15-20 g of fast carbohydrate and recheck in 15 minutes.
Written by the Glyco Defender label deskUpdated
Metformin01
Can you take blood sugar supplements with metformin?
You can only know after asking your doctor or pharmacist. No blood sugar supplement has been shown to be safe and useful alongside metformin, and the ADA advises clearing every supplement with your care team first (ADA, Vitamins & Supplements).
Metformin on its own is not one of the drugs NIDDK lists as a common cause of lows. Insulin, sulfonylureas and meglitinides are (NIDDK, Low Blood Glucose).
Some people take metformin together with one of those drugs, though. And one low-quality review suggested astragalus added glucose lowering when combined with metformin (NCCIH, Astragalus). So the question is your whole medicine list, not one pill.
Insulin02
How do supplements and insulin interact?
Supplements and insulin can interact by adding together. If an ingredient nudges glucose down while insulin is already working, the total can drop too far and cause a low.
Chromium may add to the effect of insulin and other diabetes drugs (NIH ODS, Chromium). NCCIH says Panax ginseng might lower blood sugar, so people with diabetes should talk to a provider (NCCIH, Asian Ginseng). Gymnema, studied as a glucose herb, may add to diabetes medicines too (Drugs.com, Gymnema monograph).
Other ingredients reach past glucose. The table lists the ones found in many blood sugar formulas, Glyco Defender included.
| Ingredient | What it may do | Ask about |
|---|---|---|
| Chromium | Add to glucose-lowering drugs; reduce levothyroxine absorption (NIH ODS, Chromium) | Insulin, sulfonylureas, thyroid pills |
| Gymnema | Add to diabetes medicines (Drugs.com, Gymnema monograph) | Insulin, sulfonylureas |
| Panax ginseng | Might lower blood sugar; may affect clotting (NCCIH, Asian Ginseng) | Diabetes drugs, blood thinners |
| African mango | Possible added glucose lowering, shown in rats (MSKCC, Irvingia gabonensis (African mango)) | Diabetes drugs |
| Grapefruit | Juice blocks a gut enzyme, so some drugs build up (FDA, Grapefruit juice and drugs) | Some statins, blood pressure and heart-rhythm drugs |
| Licorice compound | Glycyrrhizin can raise blood pressure and upset heart rhythm (NCCIH, Licorice Root) | Blood pressure medicines, corticosteroids |
| L-tryptophan | Adds to serotonin (Drugs.com, L-tryptophan) | MAO inhibitors, tramadol, other serotonin drugs |
| Eleuthero | Raised digoxin levels in a case report (MSKCC, Siberian Ginseng (Eleuthero)) | Digoxin |
Know a low03
What are the signs of low blood sugar on diabetes medicine?
The signs of low blood sugar are shakiness, sweating, sudden hunger, dizziness, confusion and a fast heartbeat. For many people with diabetes, a low means a reading below 70 mg/dL (NIDDK, Low Blood Glucose).
The fix is quick sugar: 15-20 g of fast carbohydrate, such as juice or glucose tablets, then a recheck after 15 minutes.
Anyone adding a supplement to insulin or a sulfonylurea should know these signs before the first dose. So should the people they live with.
- Shaky or jitteryTrembling hands, feeling nervous
- Sweaty, chillsClammy skin out of nowhere
- Hungry, nauseousSudden strong hunger
- Dizzy, confusedTrouble thinking or speaking clearly
- Fast heartbeatPounding or racing pulse
15-15For many people with diabetes, a reading under 70 mg/dL counts as a low. Have 15-20 g of fast carbohydrate (juice, glucose tablets) and recheck after 15 minutes.
Call 911If someone with a low passes out, has a seizure or cannot safely swallow. Never give food or drink to a person who is unconscious.
Signs and steps from NIDDK (NIDDK, Low Blood Glucose). Lows can come from insulin, sulfonylureas and meglitinides, and supplements may add to them (ADA, Vitamins & Supplements).
Other medicines04
Which other medicines can blood sugar supplements affect?
Blood sugar supplements can affect statins, blood pressure drugs and antidepressants, depending on what is in the bottle. Three ingredients come up most.
Grapefruit juice blocks an enzyme in the gut, so some statins and heart drugs build up to high levels (FDA, Grapefruit juice and drugs). The FDA studied the juice; whether a small seed extract does the same is not known, so ask.
Licorice holds glycyrrhizin, which can raise blood pressure. People with high blood pressure may be at risk even from small amounts (NCCIH, Licorice Root).
L-tryptophan should not be mixed with MAO inhibitors, tramadol or other serotonin-raising products without medical advice (Drugs.com, L-tryptophan).
Dose check05
Does a tiny dose change the interaction risk?
A tiny dose likely lowers the risk, but nobody has measured it. No study has tested Glyco Defender with any medicine, so a small amount is not the same as a proven safe amount.
The label order lets us set ceilings. Grapefruit seed sits 11th, so at most 15.47 / 11 = 1.4 mg. The licorice compound sits 18th, at most 0.86 mg. L-tryptophan sits 20th, at most 0.77 mg.
Chromium is printed: 7 mcg, against 200 mcg or more in glucose studies (NIH ODS, Chromium). The label itself asks anyone with a known medical condition to consult a physician first.
Weigh it, then ask
Small numbers help your pharmacist judge the risk quickly. Bring the whole blend list, because one person's statin or antidepressant is another person's non-issue. A plain-word fit check is on who Glyco Defender is for.
Glyco Defender: from $49 a bottle30 mL · 1, 3 or 6 bottles · free US shipping on 6 · 60-day money-back guarantee
See packsAsk a pharmacist06
How do you talk to a pharmacist about supplements and insulin?
Talk to a pharmacist by bringing the supplement, your full medicine list and one clear question: could this cause a low or clash with anything I take?
The FDA advises asking a doctor, pharmacist or other health professional before starting any supplement (FDA, Using Dietary Supplements). Pharmacists check interactions every day.
Bring the label
The bottle or a sharp photo of the Supplement Facts panel and the caution text.
List every medicine
Insulin doses, pills, inhalers, vitamins and herbs, with how often you take each.
Ask three things
Could it cause a low? Does it clash with any drug? Should I space it from my thyroid pill?
Plan the check-ins
Agree how often to test glucose in the first weeks and when to call.
Your prescription07
Should you ever stop a diabetes medicine to try a supplement?
No. Keep taking prescribed medicine exactly as written, whatever supplement you add. NCCIH stresses never replacing medical treatment for diabetes with an unproven product (NCCIH, Diabetes and Dietary Supplements).
The FDA has warned companies that illegally sell supplements claiming to treat diabetes (FDA, Illegally Sold Diabetes Treatments). If a seller hints that you can drop your pills, treat that as a reason to walk away.
Dose changes belong to your prescriber, based on your readings.
Track it08
What should you track after adding a supplement to diabetes medicine?
Track your glucose readings, any lows, new sleep trouble and any change in how you feel. Share the log with your doctor at the next visit, or sooner if lows appear.
A simple notebook works. Write the date, the time, the reading and what you ate. Note the day you started the supplement.
- Every reading under 70 mg/dL and what you did about it
- Jitters or poor sleep, since guarana and green tea add caffeine (MSKCC, Guarana)
- Your lab results, compared with the standard ranges
- Any new side effect; see Glyco Defender side effects
FAQ09
Supplements and diabetes medicines: questions
Can chromium cause low blood sugar with insulin?
It may. The NIH says chromium may add to the effect of insulin and other diabetes drugs, which raises the risk of lows (NIH ODS, Chromium). Ask your doctor before combining them, and know the signs: shaking, sweating, hunger and confusion.
Is gymnema safe to take with a sulfonylurea?
Ask your doctor first. Gymnema is studied as a glucose herb and may add to diabetes medicines (Drugs.com, Gymnema monograph), while sulfonylureas can cause lows on their own (NIDDK, Low Blood Glucose). Together they may push glucose lower than either alone.
Can I take Panax ginseng with diabetes medication?
Only after talking to your provider. NCCIH says ginseng might lower blood sugar and may affect blood clotting and some medicines (NCCIH, Asian Ginseng). That matters most if you use insulin, a sulfonylurea or a blood thinner.
Does grapefruit seed in a supplement affect statins?
Nobody knows for small seed extracts. The FDA warning covers grapefruit juice, which blocks a gut enzyme so some statins build up (FDA, Grapefruit juice and drugs). Not every statin is affected, so ask your pharmacist about yours.
Can licorice in a supplement raise blood pressure?
It can in large or long-term amounts. NCCIH says glycyrrhizin, the licorice compound, can cause high blood pressure and irregular heartbeat, and people with high blood pressure may be at risk even from small amounts (NCCIH, Licorice Root).
Can I take L-tryptophan with an antidepressant?
Not without medical advice. L-tryptophan should not be combined with MAO inhibitors, tramadol or other serotonin-raising products unless a doctor approves (Drugs.com, L-tryptophan). Ask about your exact antidepressant before you start.
Can a supplement change a lab test result?
Some can. In one case report, eleuthero raised blood digoxin levels and may cause falsely high digoxin test results (MSKCC, Siberian Ginseng (Eleuthero)). Tell the lab and your doctor about every supplement before any blood test.
Who wrote this10
Written and reviewed by
Pages built from the label, the sales page and linked NIH, FDA, CDC, FTC and peer-reviewed sources.
Last updated . See our editorial standards and the way we check reviews. This website is run by a USA Authorized Glyco Defender Retailer, not by the manufacturer or the distributor. We earn money when you buy through our order links.
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