Mulberries are unusually nutrient-dense berries with a range of well-studied health benefits, from helping manage blood sugar to protecting your skin from sun damage. They pack more resveratrol than grapes, deliver a solid dose of vitamin C, and contain unique compounds that slow how quickly sugar enters your bloodstream after a meal. Both the fruit and the leaves have therapeutic uses, though they work in different ways.
Nutritional Profile
A 100-gram serving of fresh black mulberries (roughly three-quarters of a cup) provides 17 to 28 milligrams of vitamin C, covering about 20 to 30 percent of your daily needs. They contain 1.7 grams of dietary fiber per 100 grams and are a reasonable source of potassium and iron. That’s a decent nutritional package for a fruit with only about 43 calories per serving.
Where mulberries really stand out is in their plant compound content. They’re rich in anthocyanins, the pigments that give dark mulberries their deep purple-black color, and they contain resveratrol at levels that dwarf most other fruits. One analysis found mulberries contained about 50.6 micrograms of resveratrol per gram of dry weight, compared to just 5.9 micrograms in grape seeds and 3.5 micrograms in grape skin. That’s roughly 8 to 14 times more resveratrol than grapes, the food most commonly associated with this compound.
Blood Sugar Control
This is probably the most well-supported benefit of mulberry, particularly from the leaves. Mulberry leaves contain a compound called 1-deoxynojirimycin (DNJ) that blocks the enzyme responsible for breaking down complex carbohydrates into glucose in your gut. The result: sugar from your meal enters your bloodstream more slowly, reducing the spike in blood sugar that follows eating. Importantly, this doesn’t prevent you from absorbing the carbohydrates. It just spreads the absorption out over a longer window, which also lowers the insulin spike.
In a clinical trial with obese people who had borderline diabetes, 12 milligrams of DNJ from mulberry leaves taken three times daily was the minimum effective dose for reducing post-meal blood sugar spikes. A dose-finding study in healthy adults confirmed that 12 mg was the threshold where meaningful glucose-lowering effects began, while 6 mg wasn’t enough. Mulberry fruit extracts work through the same mechanism, and a randomized human trial confirmed that fruit-derived extracts and pure DNJ are essentially equivalent in their ability to lower post-meal blood sugar.
If you take medication that already lowers blood sugar, this matters. One study found that people with type 2 diabetes who combined a standard diabetes drug with mulberry leaf extract had even lower glucose readings than those on the drug alone. That additive effect means there’s a real risk of blood sugar dropping too low, so anyone on diabetes medication should be cautious with mulberry supplements and monitor their levels closely.
Weight Management
A small but notable clinical trial tested white mulberry extract alongside a calorie-restricted diet in 46 overweight people. Half received 2,400 milligrams of mulberry extract daily; the other half got a placebo. Both groups ate the same 1,300-calorie diet. After three months, the mulberry group lost about 9 kilograms (roughly 20 pounds), which was about 10 percent of their starting weight. The placebo group lost only 3.2 kilograms, about 3 percent of their starting weight. Waist and thigh measurements also dropped more significantly in the mulberry group.
This is a single study with a relatively small number of participants, so the results should be taken as promising rather than definitive. The blood sugar mechanism likely plays a role here: by moderating insulin spikes after meals, mulberry extract may reduce the body’s tendency to store excess energy as fat.
Heart Health
The anthocyanins in mulberries are the same class of compounds found in blueberries, blackberries, and red grapes, and a large meta-analysis of 44 randomized controlled trials found clear cardiovascular benefits from these pigments. Purified anthocyanin supplements lowered LDL (“bad”) cholesterol by about 5.4 mg/dL, reduced triglycerides by about 6.2 mg/dL, and raised HDL (“good”) cholesterol by about 11.5 mg/dL. These aren’t dramatic shifts on their own, but they represent a meaningful nudge in the right direction, especially as part of a broader dietary pattern rich in colorful fruits.
One interesting finding: the benefits were strongest with purified anthocyanin supplements rather than whole berries. That doesn’t mean eating mulberries is useless for your heart. It suggests the dose of anthocyanins matters, and concentrated forms deliver more of these compounds per serving than the fruit alone.
Liver Protection
Animal research has shown that mulberry fruit extract can protect against non-alcoholic fatty liver disease, a condition where fat builds up in the liver of people who drink little or no alcohol. In rats fed a high-fat diet, mulberry extract significantly reduced liver fat accumulation, lowered liver weight, and brought down two key markers of liver damage (the enzymes ALT and AST that doctors measure in blood tests). Microscopic examination of liver tissue showed that mulberry treatment prevented the formation of the fatty deposits characteristic of liver disease.
These results come from animal studies, so they can’t be directly applied to humans. But the findings align with what we know about how mulberry’s antioxidant and blood-sugar-regulating properties work, and they suggest the fruit may be particularly helpful for metabolic health beyond just glucose control.
Skin Lightening and UV Protection
Mulberry has a long history in skincare, and the science backs it up. The plant produces compounds that block tyrosinase, the enzyme your skin needs to produce melanin. By inhibiting this enzyme, mulberry extracts can reduce dark spots and hyperpigmentation. One compound unique to mulberries, called mulberroside A, both suppresses melanin production and reduces the transfer of pigment within skin cells.
Lab studies show that mulberry extract can also protect against UV-induced darkening. When skin cells were exposed to UVB radiation and then treated with a high concentration of mulberry fruit extract, melanin production dropped back to baseline levels. The anthocyanin cyanidin-3-glucoside, which is abundant in mulberry fruit, appears to dial down the genes responsible for UV-triggered pigmentation.
There’s a practical caveat: extracts from mulberry roots, bark, and leaves are generally more potent for skin lightening than the fruit itself. If you’re looking at mulberry-based skincare products, those derived from the root bark tend to deliver the strongest anti-pigmentation effects.
How to Use Mulberry
Fresh mulberries are eaten like any berry and work well in smoothies, on oatmeal, or dried as a snack. Dried mulberries are widely available and retain much of their anthocyanin and resveratrol content. For blood sugar benefits specifically, mulberry leaf tea or leaf extract supplements are the more targeted option, since the leaves contain higher concentrations of the sugar-blocking compound DNJ than the fruit does.
Clinical trials have used mulberry leaf doses equivalent to 12 milligrams of DNJ taken with meals, which is the threshold found effective for reducing blood sugar spikes. Supplement labels don’t always list DNJ content, so look for products standardized to this compound if glucose management is your goal. For the fruit extract used in weight management research, the dose was 2,400 milligrams daily, though this was combined with a structured low-calorie diet rather than used on its own.