What vitamins should a diabetic take? For most people with diabetes, the answer is the same vitamins everyone needs, mostly from food. The American Diabetes Association's (ADA) Standards of Care in Diabetes—2026 say that without an underlying deficiency, there is no benefit from herbal or other vitamin or mineral supplements. Some people do run low on certain nutrients, and a clinician can check for that with a blood test.
Key takeaways
- ADA's 2026 Standards say there is no benefit from vitamin or mineral supplements for people with diabetes without an underlying deficiency. The Standards also say up to 59% of people with diabetes in the U.S. use supplements.
- ADA recommends that care teams ask about supplement use, and says magnesium, chromium, cinnamon, and aloe vera are not recommended for blood sugar benefit.
- ADA's patient page lists iron, vitamin D, vitamin B12, magnesium, and calcium as common shortfalls, and the Standards link metformin with low B12.
- The FDA does not approve dietary supplements before they are sold, so a label is not proof of what is inside.
- Supplements never replace diabetes medicine, and FDA and NIH both warn about "natural cure" claims.
Vitamins for Diabetes: The Short Answer
- Food comes first. ADA's patient guidance says whole foods are the best source of vitamins and minerals.
- A deficiency is the main reason to supplement. ADA's Standards say supplements offer no benefit without one, so the useful question is whether you are low, not which product to buy.
- A few groups may need a multivitamin. ADA names pregnant or lactating people, older adults, vegetarians, vegans, and people eating very-low-calorie or low-carb patterns.
- Supplements are not a blood sugar treatment. ADA does not recommend vitamins, minerals, or herbs for blood sugar benefit.
- Your care team decides. Testing, dosing, and interactions with your medicines are clinical questions.
Do People With Diabetes Need Extra Vitamins?
Usually not, if their eating pattern covers their needs. The Standards say that outside deficiency or overt malnutrition, supplementation is generally not recommended, and that routine antioxidant supplements such as vitamins E and C lack evidence of benefit and raise long-term safety concerns. ADA also advises counseling against β-carotene supplements, citing evidence of harm for certain individuals and no benefit.
The Standards say that for special groups, a multivitamin may be necessary. Those groups are pregnant or lactating people, older adults, vegetarians, vegans, and people following very-low-calorie or low-carbohydrate eating patterns. If you fit one of these groups, ask your clinician whether a multivitamin makes sense and which kind.
Our guide to the best diet for diabetics covers the food side of this question.
Nutrients People With Diabetes Are Asked About Most
ADA's patient page on vitamins and supplements lists iron, vitamin D, vitamin B12, magnesium, and calcium as common deficiencies. Three of them have their own guides on this site.
| Nutrient | Why it comes up | Food sources named by NIH or NIAMS | What guidelines say |
|---|---|---|---|
| Vitamin B12 | Metformin is associated with low B12 | Fish, meat, poultry, eggs, dairy, clams, oysters, fortified cereals | ADA suggests periodic B12 testing with long-term metformin, especially with anemia or nerve symptoms |
| Vitamin D | Low levels are common in some groups | Fatty fish, egg yolks, cheese, fortified milk and cereal | ADA does not recommend routine supplements without deficiency; the Endocrine Society differs for prediabetes |
| Magnesium | Diabetes can raise urinary losses | Pumpkin seeds, chia, almonds, spinach, cashews, black beans | ADA finds insufficient evidence for routine use to lower blood sugar |
| Calcium | Bone health | Milk, cheese, yogurt, salmon, sardines, kale, set tofu | See our bone health guide for ADA's bone guidance |
Read the details in metformin and vitamin B12, vitamin D and diabetes, and magnesium and blood sugar. For calcium and vitamin D for bones, see how to keep bones strong with diabetes.
When a Blood Test Makes Sense
ADA's Standards say periodic vitamin B12 testing should be considered for people taking metformin, especially with anemia or peripheral neuropathy. The National Institutes of Health (NIH) Office of Dietary Supplements says B12 deficiency can cause fatigue, anemia, numbness, and tingling, and that nerve symptoms can appear without anemia. Many of those symptoms overlap with other causes, so testing is how a clinician sorts them out. Our guides to diabetic neuropathy and tiredness with diabetes explain the overlap.
For other nutrients, testing is not routine. NIH says a magnesium blood test, for example, is not part of standard care, and vitamin D testing is a decision for your clinician. Guessing from symptoms alone can lead to taking something you do not need.
What About Herbal Supplements?
Herbs and spices are a separate question from vitamins. The National Center for Complementary and Integrative Health (NCCIH) says some studies suggest chromium, cinnamon, or berberine might help with blood sugar control, but the studies are limited in size and differ in design, so there are no clear conclusions. NCCIH adds that alpha-lipoic acid might help with diabetic nerve pain but has not been shown to lower blood sugar.
ADA's Standards say there is insufficient evidence to support routine use of cinnamon, curcumin (turmeric), aloe vera, or chromium to improve blood sugar. For product-specific reviews, see our guides to cinnamon and blood sugar, apple cider vinegar and blood sugar, and berberine.
Supplement Safety: What the Label Does Not Tell You
- No pre-sale approval. The FDA says it does not have the authority to approve dietary supplements before they are marketed, and generally does not approve supplement claims before use. A firm generally does not have to give the FDA its safety evidence, with limited exceptions for new ingredients.
- Look for a third-party seal. ADA's patient page suggests looking for the USP seal, which signals that a product was tested for what it says it contains. A seal does not tell you whether the product is right for you.
- Interactions are real. ADA says supplements can intensify or oppose diabetes medicines, which can push blood sugar too low or too high.
- Hidden ingredients happen. The FDA says products that claim to help with health issues are not reviewed by the agency and can contain hidden drug ingredients that are not on the label. Its examples of harm include increased blood sugar levels.
- Kidneys matter. NCCIH says kidney disease has been linked to some supplements and that people with or at risk for kidney disease should have a provider monitor supplement use closely. See how diabetes affects the kidneys.
Red Flags: Claims That Should Stop You
The FDA warns about diabetes products that seem too good to be true, such as those claiming to be a "natural diabetes cure" or to "replace your diabetes medicine." NCCIH says these products are marketed illegally, some are harmful in themselves, and all are harmful if used in place of effective treatment. Never stop or reduce a diabetes medicine because of a supplement claim. If you want to understand what remission honestly means, read can diabetes be reversed.
Questions to Bring to Your Care Team
- Which vitamins, minerals, herbs, and over-the-counter products am I taking, and do any interact with my medicines?
- Do my medicines, my age, or my eating pattern put me at risk for a low nutrient level?
- Should I have a vitamin B12 or vitamin D blood test, and how often?
- Is a multivitamin a good fit for me, or can I cover my needs with food?
- How will we know a supplement is helping or causing a problem?
Bring the bottles, or photos of the labels, to your visit. Our diabetes appointment checklist can help you organize the list, and the yearly diabetes tests guide shows where nutrient checks may fit.
Frequently Asked Questions
What vitamins should a diabetic take?
Most people with diabetes need the same vitamins as everyone else, ideally from food. ADA's 2026 Standards say there is no benefit from vitamin or mineral supplements without an underlying deficiency. A clinician can test for common shortfalls such as vitamin B12 or vitamin D and advise you.
Do diabetics need a multivitamin?
Not always. ADA's Standards say a multivitamin may be necessary for pregnant or lactating people, older adults, vegetarians, vegans, and people following very-low-calorie or low-carbohydrate eating patterns. Ask your clinician whether you fall into one of these groups.
Which vitamin deficiencies are common in people with diabetes?
ADA's patient page lists iron, vitamin D, vitamin B12, magnesium, and calcium as common deficiencies. Metformin is also associated with low vitamin B12, so ADA suggests periodic testing for people who take it long term. A blood test is the way to find out whether you are low.
Can vitamins lower blood sugar?
ADA does not recommend vitamin or mineral supplements for blood sugar benefit. Its Standards name magnesium and chromium, along with herbs such as cinnamon and aloe vera, as not recommended for glycemic benefit. Supplements do not replace diabetes medicine or healthy daily habits.
Is it safe to take supplements with diabetes medicine?
Not automatically. ADA says supplements can intensify or oppose the effects of diabetes medicines, which may cause low or high blood sugar. Tell your care team and pharmacist about everything you take, and do not start a new product before they review it.
How can I choose a safer supplement?
The FDA does not approve supplements before they are sold, so ADA suggests looking for the USP seal, which signals third-party testing of contents. Avoid any product that promises a cure or says it can replace your medicine, and ask your pharmacist to review the label.
References
- American Diabetes Association Professional Practice Committee for Diabetes. "5. Facilitating Positive Health Behaviors and Well-being to Improve Health Outcomes: Standards of Care in Diabetes—2026." Diabetes Care. 2026;49(Suppl. 1):S89–S131. Accessed October 2026.
- American Diabetes Association Professional Practice Committee for Diabetes. "9. Pharmacologic Approaches to Glycemic Treatment: Standards of Care in Diabetes—2026." Diabetes Care. 2026;49(Suppl. 1). Accessed October 2026.
- American Diabetes Association. "Diabetes, Vitamins & Supplements." Accessed October 2026.
- National Center for Complementary and Integrative Health. "5 Things To Know About Type 2 Diabetes and Dietary Supplements." Accessed October 2026.
- National Center for Complementary and Integrative Health. "Diabetes and Dietary Supplements: What You Need To Know." Accessed October 2026.
- National Institutes of Health Office of Dietary Supplements. "Vitamin B12: Fact Sheet for Health Professionals." Accessed October 2026.
- National Institutes of Health Office of Dietary Supplements. "Vitamin D: Fact Sheet for Health Professionals." Accessed October 2026.
- National Institutes of Health Office of Dietary Supplements. "Magnesium: Fact Sheet for Health Professionals." Accessed October 2026.
- U.S. Food and Drug Administration. "Questions and Answers on Dietary Supplements." Accessed October 2026.
- U.S. Food and Drug Administration. "Avoiding Products Contaminated with Hidden Ingredients." Accessed October 2026.
- National Institute of Arthritis and Musculoskeletal and Skin Diseases. "Calcium and Vitamin D: Important for Bone Health." Accessed October 2026.
Next Steps
Make a list of every vitamin, mineral, herb, and over-the-counter product you take, and bring it to your next visit. Ask whether a blood test for vitamin B12 or vitamin D is right for you.
For adults with type 2 diabetes or prediabetes who want lifestyle education alongside clinical care, the Done With Diabetes™ program, a type 2 diabetes protocol, organizes daily learning about meals, movement, sleep, and stress. It does not diagnose or treat nutrient deficiencies or diabetes, interpret test results, recommend supplements, change medicines, or replace your care team.