Best Supplements for Improved Insulin Sensitivity
Ranked by research evidence. Compare 113 supplements across 157 papers from the biomedical literature, with effect direction, evidence strength, and dose range for each.
Top picks by evidence
- Moderate evidence9 studies
Across 9 studies, 6 reported beneficial effects on insulin sensitivity, though effect sizes were predominantly small (3 of 6 beneficial studies) and the highest-quality evidence (a systematic review of 1063 women with PCOS) found only modest, non-significant improvements. Median study duration was 63 days (9 weeks), and the most commonly reported dose range was 1000–4000 IU/day. Effects appeared more consistent in populations with vitamin D deficiency or metabolic conditions (e.g., PCOS, gestational diabetes, obesity, diabetes/prediabetes).
Dose: 1000–4000 IU/dayProduct matchViva Naturals — Vitamin D3 with Organic Liquid Coconut Oil125 mcg · $15.16 · ★5.0 (208) - Moderate evidence6 studies
Across 6 studies, all 6 reported beneficial effects of Lactobacillus salivarius UCC118 on insulin sensitivity, with 4 reaching statistical significance. The predominant effect size was moderate. The evidence primarily comes from meta-analyses and reviews focused on pregnant women, including those with gestational diabetes mellitus (GDM), suggesting benefits for improving insulin resistance (HOMA-IR) and related glucose markers.
- Moderate evidence4 studies
Across 4 studies, all reported beneficial effects on insulin sensitivity, with effect sizes ranging from small to moderate (mixed). The strongest evidence comes from a 2025 meta-analysis of 82 randomized controlled trials involving 5,026 participants. No consistent dose range or form was identified across studies, and the median reported study duration was only 7 days.
- ModerateVitamin DAcross 9 studies, 6 reported beneficial effects on insulin sensitivity, though effect sizes were predominantly small (3 of 6 beneficial studies) and the highest-quality evidence (a systematic review of 1063 women with PCOS) found only modest, non-significant improvements. Median study duration was 63 days (9 weeks), and the most commonly reported dose range was 1000–4000 IU/day. Effects appeared more consistent in populations with vitamin D deficiency or metabolic conditions (e.g., PCOS, gestational diabetes, obesity, diabetes/prediabetes). · Dose: 1000–4000 IU/day6 beneficial3 neutral9 studies
- ModerateLactobacillus salivarius UCC118Across 6 studies, all 6 reported beneficial effects of Lactobacillus salivarius UCC118 on insulin sensitivity, with 4 reaching statistical significance. The predominant effect size was moderate. The evidence primarily comes from meta-analyses and reviews focused on pregnant women, including those with gestational diabetes mellitus (GDM), suggesting benefits for improving insulin resistance (HOMA-IR) and related glucose markers.6 beneficial6 studies
- ModerateBlack CuminAcross 4 studies, all reported beneficial effects on insulin sensitivity, with effect sizes ranging from small to moderate (mixed). The strongest evidence comes from a 2025 meta-analysis of 82 randomized controlled trials involving 5,026 participants. No consistent dose range or form was identified across studies, and the median reported study duration was only 7 days.4 beneficial4 studies
- ModerateRed GrapeAcross 3 studies, all reported beneficial effects of red grape (primarily grape seed extract) on insulin sensitivity, with effect sizes ranging from small to large. The most studied population is patients with non-alcoholic fatty liver disease (NAFLD), and the median study duration is 58 days, indicating effects typically observed at 8–12 weeks. Doses of 100–520 mg/day of grape seed extract showed improvements in insulin resistance markers such as HOMA-IR and QUICKI. · Dose: 100-520 mg/day3 beneficial3 studies
- LowGingerAcross the 3 systematic reviews and reviews in the database, 3 out of 3 studies reported small beneficial effects of ginger on improved insulin sensitivity, with 2 of these reaching statistical significance. The predominant effect size is small. The evidence is derived from populations with type 2 diabetes, metabolic dysfunction-associated steatotic liver disease (MASLD), and polycystic ovary syndrome (PCOS); no consistent dose range or study duration was reported.3 beneficial3 studies
- LowResveratrolAcross 3 studies, only 1 reported a small beneficial effect of resveratrol on improving insulin sensitivity, while 2 found neutral effects. The evidence for a beneficial effect is limited and inconsistent, with no clear dose or population pattern identified.1 beneficial2 neutral3 studies