White mulberry for sugar and weight loss: dosage (table)
White mulberry and DNJ: what was really measured in studies on postprandial glycemia, body mass, and HbA1c, what doses were administered, and when hypoglycemia is a risk.
The leaf of the white mulberry contains 1-deoxynojirimycin (DNJ), a molecule that inhibits intestinal alpha-glucosidases. This is the same point of action as acarbose, a prescription drug used in type 2 diabetes. The mechanism is therefore specific and well described, yet a lot of promises have accumulated around white mulberry that research does not confirm. Below you will find a summary of what was really measured: how much DNJ was administered to volunteers, how much postprandial sugar decreased, what happened after twelve weeks, and why the result for body mass looks much weaker than for glycemia. The table shows doses from studies, not a plan for you. How much you should take is determined by a doctor, especially if you are taking sugar-lowering medications.
KEY INFORMATION
• The extract from the white mulberry leaf reduced the peak glucose level after 75 g of sucrose by 40.0%, and the area under the insulin curve by 40% in 38 healthy individuals (Thondre et al., Nutrition & Metabolism 2021).
• The dose in studies is given in milligrams of DNJ, not in grams of leaf.
• After 12 weeks, postprandial control improved, but fasting glucose and HbA1c remained unchanged (Asai et al., 2011).
• Data on weight loss comes from studies on mice.
• With sugar-lowering medications, mulberry poses a risk of hypoglycemia.
How does white mulberry affect blood sugar levels?
It inhibits carbohydrate digestion in the intestine. DNJ is a glucose analog and blocks alpha-glucosidases, which are enzymes that break down disaccharides and oligosaccharides into simple sugars. Less glucose is produced in the intestine over a given time, so the postprandial glycemic spike is lower and more spread out over time. The effect is mechanical and appears with the first dose.
The strongest measurement in humans comes from a double-blind study with a crossover design. Thirty-eight healthy volunteers received 75 g of sucrose with mulberry leaf extract or sucrose alone. With the extract, peak glucose concentration was 40.0% lower, the area under the glucose curve was 42% lower, and the area under the insulin curve was 40% lower; all differences were statistically significant (Thondre i wsp., Nutrition & Metabolism 2021).
However, this study has a background that the reader should be aware of. It was funded by Phynova, the manufacturer of the extract used, and participated in the study design and preparation of the publication, although not in data collection and analysis. This does not invalidate the result, but it should be treated as a single measurement of one preparation, not as a property of the species.
The condition for action stems directly from the mechanism: DNJ must be in the intestine before carbohydrates arrive there. Administered after a meal, it encounters sugars that are already partially absorbed and loses most of its meaning.
How much white mulberry was administered in studies?
The dose is given in milligrams of DNJ, not in grams of dried leaf. In the study on a single dose, a significant effect appeared only at amounts corresponding to 12 and 18 mg of DNJ (Kimura i wsp., Journal of Agricultural and Food Chemistry 2007), and in the twelve-week study, 6 mg of DNJ was used three times a day. The table below compares what was actually administered and what resulted from it.
| Study | Kto i ilu | Co podano | Outcome |
|---|---|---|---|
| Kimura i wsp., 2007 | zdrowi ochotnicy | 0.4 g, 0.8 g, or 1.2 g of leaf powder (6, 12, or 18 mg of DNJ) before 50 g of sucrose | significant reduction in glucose and insulin after a meal only at 0.8 and 1.2 g |
| Lown i wsp., 2017 | 37 adults with normal glycemia | trzy dawki ekstraktu przed 50 g maltodekstryny | the area under the glucose curve was 14.0% lower at the regular dose and 22.0% lower at the double dose |
| Thondre i wsp., 2021 | 38 healthy individuals | leaf extract before 75 g of sucrose | peak glucose was 40.0% lower, area under the insulin curve was 40% |
| Asai i wsp., 2011 (badanie 2) | 76 individuals with fasting glucose 110-140 mg/dl | 6 mg DNJ trzy razy dziennie przez 12 tygodni | lepszy 1,5-anhydroglucitol, bez zmian glukozy na czczo i HbA1c |
| Yu i wsp., 2025 (metaanaliza) | 15 studies, 1202 participants | various mulberry preparations | collectively better glycemia, HbA1c, and HOMA-IR; greater benefit below 500 mg per day |
This highlights the importance of standardization. The extract used in the 2021 study had a declared 4.5-5.5% DNJ, while the powder from Kimura's study had 1.5%, so the same mass of raw material carries vastly different amounts of active substance. A label stating only "mulberry leaf extract 500 mg" does not allow the product to be related to any of these studies.
Does white mulberry help with weight loss?
This has not been demonstrated in humans. None of the described studies had body weight as a primary endpoint, and the 2025 meta-analysis collected metabolic markers, not kilograms. Data on anti-obesity effects come from animal models, which is a significant difference, not a formality.
In a study on mice with diet-induced obesity, DNJ was administered for 12 weeks. Visceral fat mass decreased, adipocyte size reduced, triglycerides in plasma dropped, and adiponectin levels increased, which the authors associate with the stimulation of beta-oxidation in the liver (Tsuduki i wsp., Food Chemistry 2013). This is a result in rodents, with doses calculated based on the body weight of the mice.
The indirect reasoning sounds reasonable: a lower insulin spike after a meal means weaker inhibition of lipolysis, so the body relies on fat for longer. However, a sensible mechanism is not proof of effectiveness, and mulberry does not replace a caloric deficit. If you are looking for ingredients with better-documented effects on appetite, you can find a comparison in the text about chromie na apetyt i poziom cukru.
Does white mulberry lower HbA1c and insulin resistance?
The evidence here diverges, and it's worth stating this plainly. A single twelve-week study did not show a change in HbA1c, while a meta-analysis of fifteen studies collectively shows such a change. There is no resolution, but there is a clear difference between postprandial control and long-term indicators.
In a randomized, placebo-controlled study, 76 individuals with fasting glucose levels between 110-140 mg/dl took an extract providing 6 mg of DNJ three times a day for 12 weeks. The concentration of 1,5-anhydroglucitol, a sensitive indicator of postprandial control, increased, while fasting glucose, glycated hemoglobin, and glycated albumin did not differ from placebo (Asai i wsp., Journal of Diabetes Investigation 2011).
A meta-analysis from 2025 included 15 randomized studies with 1202 participants suffering from metabolic disorders. Collectively, there was an improvement in fasting glucose, HbA1c, HOMA-IR, as well as lipid profile and inflammatory markers. Subgroup analysis yielded an unclear result: greater benefits were associated with shorter duration of use and doses below 500 mg per day, and preparations from different parts of the plant acted differently (Yu i wsp., International Journal of Molecular Sciences 2025).
Another study adds caution. A three-month placebo trial in individuals with prediabetes resulted in a 7.8% decrease in fasting glucose and a 7.9% decrease in HOMA-IR, but the preparation contained mulberry along with Paraguayan holly and chromium picolinate, so the contribution of mulberry alone cannot be calculated (Derosa i wsp., Phytotherapy Research 2020). A broader review of the ingredients is described in the text about supplements for insulin resistance.
How does mulberry compare to berberine and cinnamon?
It's difficult to compare them directly, as they measured different outcomes. In studies on mulberry, the endpoint was most often the glycemic response to a single meal, while in studies on berberine and cinnamon, it was fasting glucose and glycated hemoglobin. The quality of evidence also varies, and more so than the strength of the effect itself.
Berberine has the most clinical studies. A meta-analysis of fourteen randomized trials with 1068 participants showed that berberine added to lifestyle changes improves glycemia and lipid profile, but compared to oral antidiabetic medications, it does not provide better glycemic control, although it shows a mild lipid effect. The authors explicitly note that the methodological quality of the included studies was generally low (Dong i wsp., eCAM 2012). More about the ingredient itself can be found in the text about the properties and dosing of berberine.
Cinnamon performs worse than its popularity suggests. A review of eleven randomized studies involving 694 adults with type 2 diabetes, at doses ranging from 120 to 6000 mg per day, showed only a moderate effect on fasting glucose and HbA1c, and the target values recommended by the American Diabetes Association were achieved in only four trials. The diversity of studies was so great that the authors did not conduct a meta-analysis (Costello i wsp., Journal of the Academy of Nutrition and Dietetics 2016).
Gymnema sylvestre, known as gurmar, suppresses the perception of sweet taste through gymnemic acids and the peptide gurmarin, so its point of action is appetite, not digestion (Tiwari i wsp., BioMed Research International 2014).
When can white mulberry be harmful?
The most serious risk is hypoglycemia in individuals receiving pharmacological treatment. Mulberry lowers glycemia through the same mechanism as acarbose, so when added to metformin, insulin, or sulfonylurea derivatives, it can have an additive effect. A person with diabetes should only incorporate it after consulting a doctor and should check their blood sugar levels more frequently.
Gastrointestinal symptoms are reported, but measured data appear milder than common opinion suggests. In a study with three doses of extract and placebo, no statistically significant differences were found in the likelihood of gastrointestinal symptoms, such as nausea, abdominal cramps, bloating, or gas, between any of the four groups (Lown i wsp., PLoS One 2017). In a 2021 study, the extract was described as well-tolerated, and no adverse events were reported.
The 2017 study is also worth weighing on the scale of background: it was funded by a grant from Innovate UK, and among the authors is the COO of the company producing the studied extract. A conflict of interest statement was published alongside the work, so there is no need to dig it out.
Two groups remain outside the reach of evidence. Pregnant and breastfeeding women were not included in any of the described studies, so there is no basis to consider the use of mulberry during this period as verified. Similarly, for children. The lack of data does not mean that something is safe, only that no one has checked it.
Frequently Asked Questions
How much white mulberry was administered in studies on postprandial sugar?
The dose was calculated in milligrams of DNJ. Single doses corresponding to 12 and 18 mg of DNJ significantly reduced glucose and insulin after 50 g of sucrose, while 6 mg was insufficient (Kimura et al., 2007). In a twelve-week study, 6 mg of DNJ was administered three times a day.
When to take white mulberry, before or after a meal?
Before a meal. DNJ blocks the enzymes that break down carbohydrates in the intestine, so it must be there before the sugars from food arrive. In all cited studies, the extract was administered together with the carbohydrate load or just before it, never after.
Does white mulberry help with weight loss?
This has not been demonstrated in humans, as none of the studies had body mass as a primary endpoint. A reduction in visceral fat and an increase in adiponectin were noted in mice fed a high-fat diet for 12 weeks (Tsuduki et al., 2013). White mulberry does not replace a caloric deficit.
Is white mulberry safe with diabetes medications?
It requires consultation with a doctor. White mulberry lowers glycemia by the same mechanism as acarbose, so together with metformin, insulin, or sulfonylurea derivatives, it may cause hypoglycemia. When introducing the preparation, it is advisable to measure blood sugar levels more frequently during the first weeks.
Does white mulberry lower HbA1c?
The evidence is conflicting. A twelve-week placebo-controlled study with 76 participants did not show a change in HbA1c or fasting glucose, despite better postprandial control (Asai et al., 2011). A meta-analysis of 15 studies with 1202 participants showed a collective improvement in HbA1c and HOMA-IR (Yu et al., 2025).
Herbal extracts, including those from white mulberry leaves, can be found in the category of plant extracts in the u Bucha store.
This article is for informational and educational purposes and does not constitute medical advice. Before starting supplementation, consult your doctor, especially if you are taking medications regularly, are pregnant or breastfeeding, or have a chronic illness.
Author: Michał Waluk · Opublikowano: 2026-07-06 · Aktualizacja: 2026-08-15
