Ashwagandha

In a 60-day randomized, double-blind, placebo-controlled trial, participants taking Ashwagandha extract daily showed significantly greater reductions in morning cortisol levels compared to placebo.

Black Pepper

Landmark crossover study in humans (n=8 per group) demonstrating that co-administration of 20 mg piperine with 2 g curcumin increased curcumin bioavailability by 2,000%. A separate arm showed 20 mg piperine increased beta-carotene bioavailability by 60%. The mechanism involves inhibition of hepatic and intestinal glucuronidation.

Black Pepper

Review of piperine's pharmacokinetic enhancement effects across multiple human and animal studies. Piperine (5-20 mg) significantly increases the bioavailability of curcumin, resveratrol, beta-carotene, CoQ10, and several pharmaceutical drugs by inhibiting CYP3A4, CYP1A1, and P-glycoprotein efflux transporters.

Vitamin C

Vitamin C is an essential cofactor for collagen synthesis. Studies show that collagen supplementation combined with Vitamin C enhances skin benefits, making Vitamin C a critical component of any beauty-focused formula.

Biotin

Biotin (Vitamin B7) plays a role in protein metabolism and keratin production. While biotin deficiency can cause hair and nail problems, deficiency is uncommon in healthy individuals. Supplementation provides comprehensive B-vitamin support for hair, skin, and nail health.

Magnesium

Double-blind, placebo-controlled RCT of 46 elderly subjects with insomnia. Magnesium supplementation (500 mg/day) for 8 weeks significantly increased sleep time, sleep efficiency, and serum melatonin, while reducing sleep onset latency and serum cortisol (all p<0.05) versus placebo.

Magnesium

Systematic review and meta-analysis of 12 RCTs (n=1,249) examining magnesium supplementation for blood pressure. Magnesium (mean 368 mg/day) for a median of 3 months reduced systolic BP by 2.00 mmHg and diastolic BP by 1.78 mmHg versus placebo, supporting its role as an enzymatic cofactor in cardiovascular regulation.

Zinc

Cochrane systematic review and meta-analysis of 18 RCTs (n=1,781) evaluating zinc supplementation for the common cold. Zinc lozenges or syrup (doses above 75 mg/day) taken within 24 hours of symptom onset significantly reduced cold duration by approximately 1 day and reduced symptom severity in healthy adults.

Zinc

Meta-analysis of 5 RCTs examining zinc supplementation for testosterone levels. Zinc supplementation (30-250 mg/day for 4-26 weeks) in zinc-deficient or marginally deficient men significantly increased serum testosterone levels. The effect was most pronounced in men with suboptimal baseline zinc status.

Magnesium

Double-blind, placebo-controlled RCT of 46 elderly subjects with insomnia. Magnesium supplementation (500 mg/day) for 8 weeks significantly increased sleep time, sleep efficiency, and serum melatonin, while reducing sleep onset latency and serum cortisol (all p<0.05) versus placebo.

Magnesium

Systematic review and meta-analysis of 12 RCTs (n=1,249) examining magnesium supplementation for blood pressure. Magnesium (mean 368 mg/day) for a median of 3 months reduced systolic BP by 2.00 mmHg and diastolic BP by 1.78 mmHg versus placebo, supporting its role as an enzymatic cofactor in cardiovascular regulation.

Zinc

Cochrane systematic review and meta-analysis of 18 RCTs (n=1,781) evaluating zinc supplementation for the common cold. Zinc lozenges or syrup (doses above 75 mg/day) taken within 24 hours of symptom onset significantly reduced cold duration by approximately 1 day and reduced symptom severity in healthy adults.

Zinc

Meta-analysis of 5 RCTs examining zinc supplementation for testosterone levels. Zinc supplementation (30-250 mg/day for 4-26 weeks) in zinc-deficient or marginally deficient men significantly increased serum testosterone levels. The effect was most pronounced in men with suboptimal baseline zinc status.

Tribulus Terrestris

Systematic review of 7 clinical studies evaluating Tribulus terrestris for sexual dysfunction. Doses of 250-1,500 mg/day for 2-3 months improved libido scores and sexual satisfaction in both men and women. Evidence for direct testosterone elevation remains inconclusive; effects may be mediated through androgen receptor sensitivity.

Tribulus Terrestris

Double-blind, placebo-controlled RCT of 65 men with mild-to-moderate erectile dysfunction. Tribulus terrestris extract (800 mg/day) for 12 weeks significantly improved IIEF scores for erectile function and sexual satisfaction versus placebo (p<0.05), without significant changes in serum testosterone or DHT.

Saw Palmetto

Cochrane systematic review of 32 RCTs (n=5,666) evaluating Serenoa repens (saw palmetto) for lower urinary tract symptoms (LUTS) associated with benign prostatic hyperplasia. Standard-dose saw palmetto (320 mg/day) showed mild improvements in urinary symptom scores and nocturia versus placebo, though effects were modest and variable across trials.

Saw Palmetto

Double-blind RCT comparing saw palmetto extract (320 mg/day) to finasteride (5 mg/day) for 6 months in 1,098 men with BPH. Both treatments produced comparable improvements in IPSS urinary symptom scores and peak urinary flow rate, but saw palmetto had significantly fewer sexual side effects, supporting its role as a 5-alpha reductase modulator.