Health Claims

Taking ashwagandha supplements (600mg daily for 8 weeks) won't change your blood test results - at least not in a meaningful way - if you're a healthy young man doing HIIT workouts.

Quantitative

If healthy young men do intense rowing workouts for 8 weeks (about 2 months), doing short 1.5-minute bursts at very high intensity 3 times per week, they can significantly boost their aerobic fitness - improving their exercise endurance by about 17% and their peak power output by 12-23%.

Causal

Taking ashwagandha supplements while doing high-intensity interval training doesn't help your fitness any more than just doing the training by itself. That's what this study found when it tested healthy young men doing 8 weeks of workouts.

Causal

Taking ashwagandha root extract twice a day (300mg each time) for 8 weeks was completely safe for healthy athletes - they didn't experience any bad side effects during the study.

Descriptive

Can an herb called ashwagandha help athletes feel less tired and more energized?

Causal

Taking ashwagandha root extract may help athletes have more antioxidants in their bodies, which could protect them from the harmful effects of exercise-related stress.

Causal

Taking ashwagandha root extract helps athletes recover better after working out, as measured by their Total Quality Recovery scores.

Causal

Taking ashwagandha root extract (300mg twice daily for 8 weeks) can help healthy athletes improve their VO2 max, which measures how well their body uses oxygen during exercise.

Causal

Scientists tested whether an herb called ashwagandha helps young men who don't work out build muscle or get stronger, but they only studied men ages 18-50 for 8 weeks, so we don't know if it works for women, older adults, athletes, or if taking it longer makes any difference.

Descriptive

Taking ashwagandha supplements (300mg twice daily for 2 months) was safe for healthy young men who exercised - none of them had any serious side effects and everyone thought it was either good or excellent to take.

Descriptive

Taking ashwagandha supplements (300mg twice daily for 8 weeks) helps young men build more leg muscle strength during weight training compared to taking a placebo pill - about 14.5 kg more strength gain versus 9.8 kg with placebo.

Quantitative

Taking ashwagandha supplements (300mg twice daily) for 8 weeks while doing weight training may help men lose more body fat - about 3.5% versus 1.5% with a placebo pill.

Quantitative

Taking ashwagandha supplements (300mg twice a day for 2 months) may boost testosterone levels in young men who lift weights, according to one study that found a much bigger increase compared to a placebo pill.

Causal

Taking ashwagandha supplements (300mg twice daily for 8 weeks) while doing weight training makes your arm muscles and chest grow bigger compared to just doing weight training with a fake pill (placebo).

Causal

Taking ashwagandha supplements while weight training helps men build more muscle strength - they could lift about 46 kg more on bench press vs 26 kg more with placebo

Causal

Taking a specific ashwagandha supplement called KSM-66 at 300-600mg every day for about 2 months can change how strong you are, how long you can exercise, and your stress hormone levels.

Causal

Taking ashwagandha supplements (a traditional herb used for stress) every day for about 2 months can lower your body's stress hormone called cortisol in adults.

Causal

Taking ashwagandha supplements (an herb used in traditional medicine) every day for about 2 months might help people exercise longer without getting as tired by improving how efficiently their body uses oxygen during physical activity.

Causal

Taking ashwagandha supplements (300-600mg every day) for about 2 months makes people stronger at bench pressing, according to this claim.

Causal

A compound called 17-alpha-estradiol was tested in three different labs, and all three found it extended lifespan by similar amounts.

Descriptive

Scientists gave male mice a compound called 17-alpha-estradiol at different ages and found that mice treated at 16 months lived about 7% longer than untreated mice, but mice treated later at 20 months only lived about 5% longer - and that result might just be due to chance.

Quantitative

Scientists gave male mice a special form of estrogen called 17-alpha-estradiol and found that the mice lost about 20% of their body weight, and they stayed lighter the whole time they were being treated.

Quantitative

Three drugs that were thought might help mice live longer were tested, but none of them actually made the mice live longer at the doses given.

Causal

A special form of estrogen called 17-alpha-estradiol helped male mice live longer, but female mice given the same amount didn't get any lifespan benefit.

Causal