--- title: "Vitamins for diabetes: what the NIH says, label by label" description: "Do vitamins help diabetes? What NIH sources say about vitamins C, D, E, B1, biotin, zinc, chromium and magnesium, next to 23 blood sugar labels." canonical: https://glucosebench.com/vitamins-for-diabetes alternate_html: https://glucosebench.com/vitamins-for-diabetes language: en-US last_updated: 2026-10-27 type: guia --- # Vitamins and minerals for diabetes: the evidence next to 23 blood sugar labels 1. [Home](https://glucosebench.com/) 2. [Guides](https://glucosebench.com/guides) 3. Vitamins and minerals for diabetes: the evidence next to 23 blood sugar labels Blood sugar formulas often add a vitamin or mineral to the herbs, sometimes in large amounts. We lined up every one on the 23 products we've reviewed against what NIH sources say about it. By **[GlucoseBench editorial team](https://glucosebench.com/about)** Updated October 27, 2026 ![A pharmacist listening to an older woman at the pharmacy counter](https://glucosebench.com/img/guia-vitamins-for-diabetes-768.webp?v=77915d8841) Short answer According to NIDDK, the NIH's diabetes institute, there's "no clear proof" that dietary supplements, vitamins and minerals included, can help manage diabetes, though your doctor may suggest one if you can't get enough from food. The largest review summarized by NCCIH, the NIH's complementary health center, covered 178 studies: vitamins C, D and E lowered HbA1c only "with low certainty", only vitamin D held up once the poor-quality studies were set aside, and even its effect was "less than the minimal amount needed for a clinical difference." Chromium and magnesium have limited, mixed evidence, and the NIH's Office of Dietary Supplements warns that chromium taken with insulin or other diabetes medicines "might cause low blood sugar levels." On the 23 products we've reviewed, the smallest printed amount is 0.7 mcg of chromium, and the highest against the Daily Value is 100 mg of vitamin B1, printed as 8,333%. ## What the biggest review found NCCIH describes a 2022 review of 178 studies of different supplements in adults with diabetes, vitamins C, D and E among them. "An initial analysis showed that vitamins C, D, and E reduced HbA1c, but with low certainty, and none of the vitamins were effective in reducing insulin or insulin resistance." Then came the filter: "After excluding the poor-quality studies, only vitamin D was significantly effective in helpful reductions." Even that result carries its own warning. The improvements with vitamin D "were small and less than the minimal amount needed for a clinical difference," and the authors concluded "that the available evidence supports current recommendations that nutritional supplements may not be helpful for blood glucose control." NIDDK says much the same from the clinic's side: there's "no clear proof that specific foods, herbs, spices, or dietary supplements", vitamins and minerals included, "can help manage diabetes." Talk with your health care professional before you take any, it says, "because some may cause side effects or affect how well your diabetes medicines work." One nuance matters. For a few nutrients, people with diabetes are more likely to run low. The NIH's Office of Dietary Supplements (ODS) says "People with diabetes often have low levels of thiamin in their blood" and "People with type 2 diabetes often have low zinc levels," and it lists type 2 diabetes among the conditions that make low magnesium more likely. Running low and needing a supplement aren't the same thing, and that call belongs to your doctor. ## Every vitamin and mineral on the labels, next to the NIH read Twenty-three products in our 22 reviews (the GlucoTrust review covers the capsule and the chewable Bites). Six rows, vitamin B2, niacin, pantothenic acid, vitamin B6, calcium and potassium, come from one label only: Gluco Shield Pro's. Amounts are as printed; "no amount" means the seller names the nutrient without a dose. Nutrient Products here that list it What the NIH source says The caveat, same source Chromium 16 of 23, from 0.7 mcg (GlycoFortin, Glycovit, Glycotide, Olivaro, GlycoHarmony, Glycopezil) to 1 mg (Insufend, Gluco6). Full list in our chromium guide NCCIH: a 2022 review suggested it "may help improve" HbA1c, fasting blood glucose and insulin resistance in type 2 diabetes NCCIH: "a few reports of kidney damage, liver damage" after large doses. ODS: study results are "mixed", and with insulin or other diabetes medicines it "might cause low blood sugar levels" Magnesium 5: Nucentix GS-85 250 mg, Blood Sugar Blaster 125 mg, Glucotide 125 mg, Glyco Pulse 20 mg, Gluco Shield Pro 12.5 mg NCCIH: a 2021 review found supplements "may improve insulin sensitivity" in people at high risk of diabetes NCCIH: research in people with diabetes "is insufficient for providing any clinical guidelines"; the adult limit from supplements and medications is 350 mg a day Vitamin D 3: Glyco Pulse 25 mcg, Insufend 50 mcg (250% DV), Gluco6 50 mcg (250% DV) NCCIH: the only vitamin left standing in the 2022 review NCCIH: the effect was "less than the minimal amount needed for a clinical difference," and ODS reads the trials as showing no improvement. Both sources, prediabetes included, are in our vitamin D guide Vitamin C 4: Nucentix GS-85 100 mg (112% DV), Glyco Pulse 90 mg, Glucotide 53 mg (59% DV), Blood Sugar Blaster 50 mg (56% DV) NCCIH: lowered HbA1c in the 2022 review's first pass, "but with low certainty" NCCIH: not among the results left once poor-quality studies were excluded. ODS: too much "can cause diarrhea, nausea, and stomach cramps" Vitamin E 3: Nucentix GS-85 30 mg (200% DV), Glucotide 16 mg (107% DV), Blood Sugar Blaster 15 mg (100% DV) NCCIH: same as vitamin C, a low-certainty HbA1c drop in the first pass NCCIH: gone once poor-quality studies were excluded. ODS: high doses "might increase the risk of bleeding," and it interacts with blood thinners such as warfarin Thiamin (vitamin B1) 3: Insufend 100 mg (8,333% DV), Gluco6 100 mg (8,333% DV), Gluco Shield Pro 6 mg (500% DV) ODS: "People with diabetes often have low levels of thiamin in their blood" ODS: whether supplements improve blood sugar is still being studied. It "has not been shown to cause any harm" Riboflavin (vitamin B2) 1: Gluco Shield Pro 6 mg (462% DV) ODS's riboflavin fact sheet doesn't mention blood sugar or diabetes at all ODS: "Riboflavin is not known to interact with any medications" Niacin (vitamin B3) 1: Gluco Shield Pro 14 mg (88% DV) ODS: "High doses of nicotinic acid (1,500 mg/day or more) can raise blood sugar levels and interfere with the effectiveness of diabetes medications" ODS: the adult upper limit from supplements is 35 mg a day. Gluco Shield Pro's 14 mg is under it, and about a hundredth of the dose that warning is about Pantothenic acid (vitamin B5) 1: Gluco Shield Pro 8 mg (160% DV) ODS's pantothenic acid fact sheet doesn't mention blood sugar or diabetes at all ODS: "Pantothenic acid is safe, even at high doses," and it "is not known to interact or interfere with any medicines" Vitamin B6 1: Gluco Shield Pro 4 mg (235% DV) ODS's vitamin B6 fact sheet doesn't mention blood sugar or diabetes at all ODS: the US upper limit for adults is 100 mg a day, and "Some experts recommend lower limits for vitamin B6", such as Europe's 12 mg Biotin 6: Nucentix GS-85 600 mcg (2,000% DV), Glucotide 315 mcg (1,050% DV), Blood Sugar Blaster 300 mcg (1,000% DV), Gluco Shield Pro 150 mcg (500% DV); GlucoTrust and Glucore, no amount ODS's biotin fact sheet doesn't mention blood sugar or diabetes at all ODS: biotin "above recommended amounts may cause false results in some lab tests," thyroid tests among them Zinc 5: Nucentix GS-85 15 mg (136% DV), Gluco Shield Pro 12.5 mg (114% DV), Glucotide 8 mg (73% DV), Blood Sugar Blaster 7.5 mg (68% DV); GlucoTrust, no amount ODS: some research shows zinc supplements "might help lower blood sugar and cholesterol levels" ODS: "more research is needed"; too much causes nausea, dizziness, headaches and upset stomach, and the adult limit is 40 mg a day from all sources Manganese 4: Nucentix GS-85 2 mg (86% DV), Blood Sugar Blaster 1 mg (43% DV), Glucotide 1 mg (43% DV); GlucoTrust, no amount ODS: you need it to break down starches and sugars ODS: "its effect on the risk of diabetes is unknown"; the adult limit is 11 mg a day from all sources Calcium 1: Gluco Shield Pro 13 mg (1% DV) ODS mentions blood sugar only under metabolic syndrome: "Some research suggests that a higher intake of calcium might help lower the risk of metabolic syndrome in women but not men" ODS: the adult upper limit is 2,000 to 2,500 mg a day from all sources, and supplements "can interact or interfere with certain medicines" Potassium 1: Gluco Shield Pro 12.5 mg (under 2% DV) ODS: "Low intakes of potassium might increase blood sugar levels," though "more research is needed" on blood sugar and the risk of type 2 diabetes ODS: "getting too much potassium from supplements or salt substitutes can cause hyperkalemia," and "some medications may interact with potassium" Vanadium 3: Blood Sugar Blaster and Nucentix GS-85 (amount not printed), GlucoTrust Bites (no amount) Not covered in NCCIH's diabetes fact sheet, and ODS has no fact sheet on it No NIH source to weigh the label against Selenium None of the 23 NCCIH: a 2019 review of 4 studies "showed no evidence that selenium helps with diabetes" NCCIH: too much over time can cause nausea, diarrhea, skin rashes, and hair and nail loss Sources: NCCIH, "Diabetes and Dietary Supplements: What You Need To Know" (last updated November 2023), and the ODS fact sheets for consumers on biotin, chromium, magnesium, manganese, thiamin, vitamin C, vitamin D, vitamin E and zinc, and on multivitamin/mineral supplements (updated between January 2021 and February 2024), all read on September 27, 2026, plus the ones on riboflavin, niacin, pantothenic acid, vitamin B6, calcium and potassium (updated between March 2021 and May 2026), read on October 27, 2026. Upper limits are the ODS figures for adults and count every source you take, not one product. Label amounts come from each official page and label, read on September 25 and 27, 2026 (Gluco6, GlycoBalance, Olivaro, GlycoHarmony, Glycopezil, Glucotide, Gluco Shield Pro and Nucentix GS-85 on October 27, 2026); GLPro and GLPro Patches list no ingredients at all, CelluFend is a probiotic with fiber, Gluco Extend names no specific vitamin or mineral, and Gluco Cleanse Tea, an herbal tea with no ingredient panel, lists none either. ## Should you take a multivitamin? ### None of these is one The 23 products are blood sugar formulas, not multivitamins. ODS describes that type: some multis are promoted "for specific purposes" and "often contain herbal and other ingredients" on top of the vitamins. Gluco Shield Pro comes closest, with ten vitamin and mineral amounts plus an 18-ingredient blend; Blood Sugar Blaster, Glucotide and Nucentix GS-85 print seven. ### What a basic one looks like ODS describes "basic, once-daily products that contain all or most vitamins and minerals in amounts close to what is recommended," and says the choice is one to make with your provider: "Talk to your health care provider about whether you should take an MVM and, if so, which one is best for you." ### Stacking adds up A multivitamin "can also raise the chances of getting too much of some nutrients, such as iron, vitamin A, zinc, niacin, and folic acid." Add a blood sugar formula on top and the zinc, chromium and biotin from both count toward the same day. ## Three checks before you add one ### Chromium and your medicine ODS says chromium with insulin "might cause low blood sugar levels," and the same for metformin and other diabetes medicines. Sixteen of these labels list chromium, so this check applies to most of them. ### Biotin and your lab work Biotin above the recommended amount can skew some lab results, according to ODS. The four labels here that print an amount run from 500% to 2,000% of the Daily Value; if you take one, tell whoever orders your blood tests. ### Your kidneys NCCIH: "Kidney disease has been linked to using some dietary supplements. This is of particular concern for people with diabetes, since diabetes is the leading cause of kidney disease." If you have it or are at risk, it says a provider should closely monitor your supplements. ## Frequently asked questions **What vitamins are good for diabetes?** None has clear proof of helping manage diabetes, according to NIDDK. In the largest review NCCIH summarizes, only vitamin D held up after poor-quality studies were excluded, and its effect was too small to make a clinical difference. Your doctor may still suggest a vitamin or mineral if you can't get enough from food. **Can vitamins lower blood sugar?** Not by an amount that matters, based on what NIH sources report. The 2022 review NCCIH describes found low-certainty HbA1c drops for vitamins C, D and E, and its authors concluded that nutritional supplements "may not be helpful for blood glucose control." **Is vitamin C good for diabetes?** Vitamin C lowered HbA1c in that review's first pass, with low certainty, and dropped out once poor-quality studies were excluded. ODS lists diarrhea, nausea and stomach cramps as signs of too much. Four products we've reviewed contain it: Nucentix GS-85 (100 mg), Glyco Pulse (90 mg), Glucotide (53 mg) and Blood Sugar Blaster (50 mg). **What is a good multivitamin for diabetics?** ODS says to ask your health care provider whether you need one and which. It describes basic once-daily multis with amounts close to what's recommended, and warns that some contain more than that. The blood sugar formulas we've reviewed aren't multivitamins. **Do any supplements help type 2 diabetes?** NCCIH's answer is that a few, such as chromium, cinnamon or berberine, have "weak evidence of a possible benefit," and "for most supplements, there isn't evidence to support a beneficial effect on diabetes or its complications." It calls it "very important not to replace medical treatment for diabetes with an unproven health product or practice." ## Sources U.S. government health pages this one draws on. Each opens in a new tab. 1. [Diabetes and Dietary Supplements: What You Need To Know](https://www.nccih.nih.gov/health/diabetes-and-dietary-supplements-what-you-need-to-know), National Center for Complementary and Integrative Health (NIH) 2. [Healthy Living with Diabetes](https://www.niddk.nih.gov/health-information/diabetes/overview/healthy-living-with-diabetes), National Institute of Diabetes and Digestive and Kidney Diseases (NIH) 3. [Biotin: Fact Sheet for Consumers](https://ods.od.nih.gov/factsheets/Biotin-Consumer/), NIH Office of Dietary Supplements 4. [Chromium: Fact Sheet for Consumers](https://ods.od.nih.gov/factsheets/Chromium-Consumer/), NIH Office of Dietary Supplements 5. [Magnesium: Fact Sheet for Consumers](https://ods.od.nih.gov/factsheets/Magnesium-Consumer/), NIH Office of Dietary Supplements 6. [Manganese: Fact Sheet for Consumers](https://ods.od.nih.gov/factsheets/Manganese-Consumer/), NIH Office of Dietary Supplements 7. [Thiamin: Fact Sheet for Consumers](https://ods.od.nih.gov/factsheets/Thiamin-Consumer/), NIH Office of Dietary Supplements 8. [Vitamin C: Fact Sheet for Consumers](https://ods.od.nih.gov/factsheets/VitaminC-Consumer/), NIH Office of Dietary Supplements 9. [Vitamin D: Fact Sheet for Consumers](https://ods.od.nih.gov/factsheets/VitaminD-Consumer/), NIH Office of Dietary Supplements 10. [Vitamin E: Fact Sheet for Consumers](https://ods.od.nih.gov/factsheets/VitaminE-Consumer/), NIH Office of Dietary Supplements 11. [Zinc: Fact Sheet for Consumers](https://ods.od.nih.gov/factsheets/Zinc-Consumer/), NIH Office of Dietary Supplements 12. [Multivitamin/mineral Supplements: Fact Sheet for Consumers](https://ods.od.nih.gov/factsheets/MVMS-Consumer/), NIH Office of Dietary Supplements 13. [Riboflavin: Fact Sheet for Consumers](https://ods.od.nih.gov/factsheets/Riboflavin-Consumer/), NIH Office of Dietary Supplements 14. [Niacin: Fact Sheet for Consumers](https://ods.od.nih.gov/factsheets/Niacin-Consumer/), NIH Office of Dietary Supplements 15. [Pantothenic Acid: Fact Sheet for Consumers](https://ods.od.nih.gov/factsheets/PantothenicAcid-Consumer/), NIH Office of Dietary Supplements 16. [Vitamin B6: Fact Sheet for Consumers](https://ods.od.nih.gov/factsheets/VitaminB6-Consumer/), NIH Office of Dietary Supplements 17. [Calcium: Fact Sheet for Consumers](https://ods.od.nih.gov/factsheets/Calcium-Consumer/), NIH Office of Dietary Supplements 18. [Potassium: Fact Sheet for Consumers](https://ods.od.nih.gov/factsheets/Potassium-Consumer/), NIH Office of Dietary Supplements ## Related pages Guides ### [Chromium for blood sugar: same mineral, a thousandfold difference](https://glucosebench.com/chromium-for-blood-sugar) The NIH's complementary health center (NCCIH) calls chromium an essential trace mineral that your body needs to use glucose efficiently; the NIH's Office of Dietary… Guides ### [Magnesium and blood sugar: what a supplement can and cannot add](https://glucosebench.com/magnesium-for-blood-sugar) Magnesium is essential to how the body processes glucose, and people who get more of it from food tend to have a lower risk of developing diabetes, according to the… Guides ### [Vitamin D for blood sugar: one prediabetes signal, several limits](https://glucosebench.com/vitamin-d-and-blood-sugar) Vitamin D isn't a way to bring blood sugar down. Reviews ### [Blood Sugar Blaster review: good numbers on the label, bad advice on the page](https://glucosebench.com/blood-sugar-blaster) We don't recommend Blood Sugar Blaster, and on October 27, 2026 its domain had no web address in DNS, so the website couldn't load. Updated October 27, 2026. [See our full method](https://glucosebench.com/how-we-choose) --- ## GlucoseBench - GlucoseBench, published by Grupo Marfre Automação e Tecnologia (Contagem, Brazil) - Email: contact@glucosebench.com - Home: https://glucosebench.com/ - llms.txt: https://glucosebench.com/llms.txt · llms-full.txt: https://glucosebench.com/llms-full.txt · sitemap: https://glucosebench.com/sitemap.xml