Benefits
Body weight and body fat in female combat athletes
In a 30-day trial in 30 female combat sports athletes, 400 mg a day of tangeretin in whey protein lowered body weight and body fat percentage and raised HDL cholesterol more than whey alone. Strength and VO2max did not change differently between groups. The tangeretin was the researchers' own product, and the trial was not registered.
Aerobic capacity in endurance athletes
In a 4-week trial in 30 endurance athletes with exercise-triggered airway narrowing, 200 mg a day of tangeretin in a whey drink improved VO2max and time to exhaustion compared with whey alone, but partly because VO2max fell on placebo and end values were similar. The post-exercise lung function difference from placebo was not significant.
Cortisol response to heavy resistance exercise
In 24 professional soccer players, 4 weeks of 200 mg a day of tangeretin in a whey drink lowered serum cortisol at rest compared with whey alone, with lower ACTH and white blood cell counts after a heavy lifting session. Strength and body composition did not differ, and some results conflict between sections of the paper, which was not registered.
Muscle endurance and fiber type in laboratory mice
In mice, tangeretin increased the share of slow, fatigue-resistant oxidative muscle fibers and improved running endurance and aerobic metabolism. The effect depended on the adiponectin receptor AdipoR1 in muscle. These are animal and cell findings and have not been tested this way in people.
Fat and sugar metabolism in mice on a high-fat diet
In mice fed a high-fat diet, long-term tangeretin reduced weight gain, liver fat and insulin resistance, lowered inflammatory gene activity, increased brown-like fat cells and shifted gut bacteria. These are animal findings; the doses and forms do not translate directly to supplements.
Brain uptake and nerve cell protection in rats
In rats given oral tangeretin for 28 days, it was detected in several brain regions, showing it can cross the blood-brain barrier. In a toxin model used to study Parkinson's disease, a few days of pretreatment reduced the loss of dopamine-producing nerve cells. This is animal evidence only.
Mechanism of action
Poor and formulation-dependent absorption
Tangeretin dissolves poorly in water. In rats, absolute oral bioavailability was 27% in one study but below about 3% from a plain suspension in another, rising to about 6% with a cyclodextrin carrier; it was cleared mainly as metabolites. Reviewers describe emulsions and encapsulation as ways to improve uptake.
Activates the AdipoR1 and AMPK pathway in muscle
In mouse muscle and cultured muscle cells, tangeretin bound adiponectin receptor 1 and switched on AMPK and PGC-1alpha signaling, which drives the formation of oxidative, endurance-type fibers. Shown in mice and cells only.
Stimulates CYP3A4 in lab tests but not clearly in people
In human liver microsomes tangeretin strongly stimulated CYP3A4, the enzyme that clears midazolam. In 8 volunteers, tangerine juice only delayed midazolam absorption and did not change its overall metabolism, so the lab finding did not carry over to people.
Dampens natural killer cell activity in lab tests
In cell tests tangeretin reduced the activity of natural killer immune cells. In mice carrying human breast tumor cells, it did not slow tumor growth and cancelled the effect of tamoxifen, even though both had slowed the same cells in culture. This is a classic case of a lab result reversing in animals.
Clinical trials
Paired, randomized, double-blind, placebo-controlled trial of tangeretin (stated 99.79% purity, the research team's self-developed product) added to 29.6 g whey protein isolate; the placebo was 30 g whey protein alone. The authors themselves were not blinded to grouping. Funded by a Shanghai University of Sport laboratory; no conflicts of interest declared; no trial registration given. (Xingchen et al. 2026, J Int Soc Sports Nutr)
30 national first-class or higher female combat sports athletes from Shanghai professional teams (wrestling, boxing, sanda, judo and taekwondo), mean age about 19, 15 per group. They took 400 mg/day of tangeretin or placebo for 30 days with supervised team meals and no calorie restriction.
Body weight fell 1.17% with tangeretin and rose 0.49% with placebo (group by time P = 0.018), and body fat percentage fell from 23.92% to 22.92% versus no change on placebo (P = 0.008). HDL cholesterol rose more than placebo (P = 0.021). Triglycerides, LDL cholesterol and VO2max (P = 0.445) did not differ between groups, and no strength interaction was significant; the tangeretin group was stronger at baseline, and text and tables disagree on torque results. No adverse reactions were reported.
Placebo-controlled, double-blind, paired randomized trial of tangeretin (stated 99.79% purity, made with the authors' own methods and sold only by the Southwest Institute of Fruits Nutrition) in a 19.8 g whey protein drink before training; the placebo drink held the same whey only. Funded by a Shanghai University of Sport graduate grant; no conflicts of interest declared; no trial registration given. (Cao et al. 2024, J Int Soc Sports Nutr)
30 national-level endurance athletes (16 men, 14 women, mean age 24) from one provincial team, all with exercise-induced bronchoconstriction; 200 mg/day tangeretin or placebo for 4 weeks.
The post-exercise fall in FEV1 shrank within the tangeretin group (16.1% to 9.9%), but the end-of-study difference from placebo was not significant (p = 0.061), nor was the share testing negative (6 of 15 vs 1 of 15, p = 0.096); the abstract reports these differently. VO2max and time to exhaustion showed significant group by time interactions, partly because VO2max fell on placebo, and IL-8 fell. No discomfort was reported.
Paired, randomized, double-blind trial of tangeretin (stated 99.79% purity, the authors' self-developed product, sold only by the Southwest Institute of Fruits Nutrition) in a whey protein drink; the control drink held 20 g whey protein only. Funded by a Shanghai University of Sport laboratory; no commercial or financial conflicts declared; no trial registration given. (Liu et al. 2022, Front Physiol)
24 professional soccer players (14 men, 10 women, mean age 20) during winter training; 200 mg/day tangeretin or control for 4 weeks, with a heavy resistance session before and after.
Serum cortisol fell within the tangeretin group at rest and after exercise and was lower than control at rest; ACTH was lower at 30 minutes and white blood cell counts were lower after exercise. Strength (10RM), lactate and body composition did not change differently between groups. The abstract and results sections give opposite directions for the SOD antioxidant enzyme difference and different time points for the cortisol difference.
Human liver microsome and recombinant enzyme experiments, plus a randomized crossover drug interaction study in volunteers. (Backman et al. 2000, Clin Pharmacol Ther)
8 healthy volunteers took 15 mg oral midazolam in a control phase and with 200 mL tangerine juice.
In liver microsomes tangeretin raised midazolam 1'-hydroxylation by up to 212%, a sign of CYP3A4 stimulation. In volunteers, tangerine juice cut early midazolam exposure (AUC 0 to 1.5 h) by 39% and delayed its peak, but total AUC, half-life and the metabolite ratio did not change. The authors conclude the lab result did not predict the effect in people.