You can lower your blood sugar through a combination of dietary changes, natural supplements, and prescription medications, depending on how high your levels are and whether you have a diabetes diagnosis. The American Diabetes Association recommends keeping fasting blood sugar between 80 and 130 mg/dL and post-meal readings below 180 mg/dL. What you need to hit those targets ranges from simple food swaps to prescription drugs, and many people use several strategies at once.
Dietary Changes That Lower Blood Sugar
Food is the most direct lever you have over your blood sugar, and a few specific strategies have solid evidence behind them.
Soluble fiber slows the rate at which sugar enters your bloodstream after a meal. It forms a gel-like substance in your gut that delays digestion, which blunts the post-meal spike that causes problems. A study published in the New England Journal of Medicine found that people with diabetes who ate 50 grams of fiber a day, particularly soluble fiber, managed their glucose levels more easily than those who ate less. You don’t need to hit 50 grams to see a benefit, but increasing your intake of oats, beans, lentils, flaxseed, and vegetables is one of the simplest things you can do. Most people eat far less fiber than they should.
Apple cider vinegar is a surprisingly well-supported option. Two tablespoons taken immediately before a meal can reduce blood sugar spikes and help lower glucose levels over time. The acetic acid in vinegar appears to slow stomach emptying and improve how your muscles take up sugar. Dilute it in water to protect your teeth and throat.
Beyond these specific additions, the broader pattern matters: reducing refined carbohydrates, pairing carbs with protein or fat, eating vegetables first in a meal, and keeping portion sizes consistent all help prevent the sharp glucose swings that make blood sugar hard to manage.
Supplements With Evidence
Berberine is the most studied natural supplement for blood sugar. It’s a compound found in several plants, including goldenseal and barberry. In a 12-week clinical trial comparing berberine (500 mg twice daily) to the standard diabetes drug metformin (500 mg twice daily) in people with prediabetes, berberine lowered fasting blood sugar by an average of 12.6 mg/dL compared to 10.8 mg/dL for metformin. It also reduced post-meal glucose by about 22 mg/dL versus 19 mg/dL for metformin. Both groups saw similar improvements in HbA1c, the three-month blood sugar average. Gastrointestinal side effects like stomach upset occurred in 20% of people taking berberine, compared to 30% on metformin.
These are modest numbers, and the study was small (90 participants), but berberine is one of the few supplements that performs comparably to a prescription medication in head-to-head trials. It’s worth discussing with your doctor because it can interact with other medications.
Cinnamon has shown real, if smaller, effects. Cassia cinnamon (the common variety sold in grocery stores) at doses of 1 to 6 grams per day has been tested in several trials. One 40-day trial found that 1, 3, or 6 grams daily all produced significant improvements in blood sugar control in people with type 2 diabetes. A 12-week study using 2 grams per day found meaningful reductions in both fasting blood sugar and HbA1c compared to placebo. That’s roughly half a teaspoon to a full teaspoon of ground cinnamon, an easy addition to oatmeal, coffee, or smoothies.
Magnesium plays a role in how your body processes insulin, and many people with blood sugar problems are low in it. The evidence is mixed, though. Studies in people who are actually magnesium-deficient and insulin-resistant have shown improvements with supplementation around 600 to 630 mg per day. But a 12-week trial using 400 mg daily in people with metabolic syndrome who weren’t selected for magnesium deficiency showed no improvement in insulin resistance. The takeaway: magnesium supplementation helps if you’re deficient, but it’s not a universal fix. Leafy greens, nuts, seeds, and beans are all good dietary sources.
Common Prescription Medications
If diet and supplements aren’t enough, prescription medications target blood sugar through different mechanisms. Your doctor will choose based on your specific situation, but here’s what the major categories actually do in your body.
Metformin is typically the first medication prescribed for type 2 diabetes, and it works on three fronts: it reduces the amount of sugar your liver releases into your blood, decreases how much sugar your gut absorbs from food, and helps your muscles use sugar more effectively. It doesn’t force your pancreas to make more insulin, which means it carries a low risk of pushing your blood sugar too low. Stomach issues are the most common side effect, and they usually improve after a few weeks.
GLP-1 medications mimic a hormone your small intestine naturally produces after you eat. This hormone triggers your pancreas to release insulin when your blood sugar is high and blocks the release of glucagon, a hormone that raises blood sugar. Because they only stimulate insulin when sugar is elevated, they have a lower risk of causing dangerous drops in blood sugar. These medications also slow digestion and reduce appetite, which is why many people lose weight while taking them.
SGLT2 inhibitors take a completely different approach. They work in your kidneys. Normally, your kidneys filter sugar out of your blood and then reabsorb about 90% of it back into your body. SGLT2 inhibitors block that reabsorption, so you excrete excess sugar through your urine instead. This lowers blood sugar in a way that’s independent of insulin, and as blood sugar falls, the effect naturally tapers off, which limits the risk of going too low. These medications also have cardiovascular and kidney-protective benefits that extend beyond blood sugar control.
What “Too Low” Looks Like
Lowering blood sugar is the goal, but going too far creates its own emergency. Blood sugar below 70 mg/dL is considered low, and below 54 mg/dL is severe. Early warning signs include a fast heartbeat, shaking, sweating, anxiety, dizziness, and sudden hunger. If it drops further, you may feel weak, have trouble walking or seeing clearly, become confused, or in rare cases have seizures.
This risk is highest with medications that directly increase insulin, like certain older diabetes drugs. Metformin, GLP-1 medications, and SGLT2 inhibitors carry lower risk on their own. Dietary changes and supplements rarely cause hypoglycemia unless combined with insulin or insulin-stimulating drugs. If you’re stacking multiple blood sugar-lowering strategies, monitoring with a home glucose meter helps you see where your levels actually land throughout the day.
Putting It Together
Most people benefit from layering approaches. Dietary changes, especially more fiber and fewer refined carbs, form the foundation. Adding a supplement like berberine or cinnamon can provide an extra nudge, particularly if you’re in the prediabetes range. Prescription medications become important when lifestyle changes alone can’t keep your numbers in target. The right combination depends on where your blood sugar is starting, whether you’re already on medication, and how your body responds over weeks and months of consistent effort.