Best Supplements for Reduced Postprandial Glucose
Ranked by research evidence. Compare 36 supplements across 46 papers from the biomedical literature, with effect direction, evidence strength, and dose range for each.
Top picks by evidence
- Moderate evidence5 studies
Across 5 studies, 4 reported beneficial effects of white mulberry on reducing postprandial glucose, with effect sizes ranging from small to moderate. The predominant effect size is small-to-moderate, and the evidence includes multiple RCTs, though one smaller trial in people with type 2 diabetes showed a non-significant neutral effect. Doses varied widely (e.g., 250 mg to ~1.5 g per serving), and most studies involved single-meal acute challenges rather than long-term supplementation.
Dose: 250 mg to ~1.5 g per serving (as mulberry fruit or leaf extract, administered with a carbohydrate-containing meal) - Low evidence4 studies
Across 4 studies on black cumin (Nigella sativa) supplementation for reducing postprandial glucose, 2 reported beneficial effects of moderate-to-small size, while 2 found no significant benefit (neutral). The aggregate finding is mixed, with a predominant small effect size. The most robust evidence comes from a large 2025 meta-analysis (82 RCTs, 5026 participants) showing moderate beneficial effects at doses of 200 to 4600 mg/day, though two other meta-analyses/systematic reviews and one small RCT show neutral or small beneficial results. Median study duration was 60 days, but findings are not uniform across populations.
Dose: 200 to 4600 mg/day - Low evidence3 studies
Across 3 studies, 2 reported beneficial effects (1 large, 1 moderate) of whey protein on reducing postprandial glucose, while 1 study found a neutral effect. The most commonly studied dose range was 12.5–55 g premeal, and the evidence predominantly applies to adults including pregnant women. Median study duration was only 7 days, so long-term effects are not established.
Dose: 12.5–55 g premeal
- ModerateWhite MulberryAcross 5 studies, 4 reported beneficial effects of white mulberry on reducing postprandial glucose, with effect sizes ranging from small to moderate. The predominant effect size is small-to-moderate, and the evidence includes multiple RCTs, though one smaller trial in people with type 2 diabetes showed a non-significant neutral effect. Doses varied widely (e.g., 250 mg to ~1.5 g per serving), and most studies involved single-meal acute challenges rather than long-term supplementation. · Dose: 250 mg to ~1.5 g per serving (as mulberry fruit or leaf extract, administered with a carbohydrate-containing meal)4 beneficial1 neutral5 studies
- LowBlack CuminAcross 4 studies on black cumin (Nigella sativa) supplementation for reducing postprandial glucose, 2 reported beneficial effects of moderate-to-small size, while 2 found no significant benefit (neutral). The aggregate finding is mixed, with a predominant small effect size. The most robust evidence comes from a large 2025 meta-analysis (82 RCTs, 5026 participants) showing moderate beneficial effects at doses of 200 to 4600 mg/day, though two other meta-analyses/systematic reviews and one small RCT show neutral or small beneficial results. Median study duration was 60 days, but findings are not uniform across populations. · Dose: 200 to 4600 mg/day2 beneficial2 neutral4 studies
- LowWhey ProteinAcross 3 studies, 2 reported beneficial effects (1 large, 1 moderate) of whey protein on reducing postprandial glucose, while 1 study found a neutral effect. The most commonly studied dose range was 12.5–55 g premeal, and the evidence predominantly applies to adults including pregnant women. Median study duration was only 7 days, so long-term effects are not established. · Dose: 12.5–55 g premeal2 beneficial1 neutral3 studies