Studies

Backed by Human Research

At Nutrive™, we build our formulas around ingredients that have been studied in humans for their effects on metabolism, performance, and overall vitality. Below is a sample of independent research on key ingredients found in our products, including L-carnitine, shilajit, and Manuka honey. These studies do not test Nutrive™ products themselves, but they help explain why these ingredients are so popular with athletes, busy professionals, and people who care about feeling their best.

We encourage you to click through and read the original research for yourself, and to talk with your healthcare provider about what is right for you.L-Carnitine: Human Research

  1. Effects of nine weeks L‑carnitine supplementation on exercise performance and markers of oxidative stress in resistance‑trained men
    Randomized, placebo‑controlled trial in resistance‑trained men. L‑carnitine improved exercise performance and reduced blood lactate and oxidative stress markers, suggesting better training capacity and recovery.
    View study
  2. L‑Carnitine tartrate supplementation for 5 weeks improves markers of muscle recovery after exercise: a randomized, double‑blind, placebo‑controlled trial
    Five weeks of L‑carnitine tartrate improved perceived recovery and soreness, lowered creatine kinase, and helped maintain strength and power after intense exercise compared with placebo.
    View study
  3. The effects of L‑carnitine supplementation during concurrent training on body composition and physical performance in young men
    Double‑blind, placebo‑controlled trial. L‑carnitine taken during 12 weeks of training reduced body fat percentage, increased lean mass, and improved strength and endurance versus placebo.
    View study
  4. Beneficial effects of L‑carnitine supplementation for weight management: a systematic review and meta‑analysis
    Meta‑analysis of clinical trials showing that L‑carnitine supplementation produced modest but statistically significant improvements in body weight and BMI, especially in overweight individuals.
    View study
  5. A pilot clinical trial on L‑carnitine supplementation in overweight subjects in combination with physical exercise
    Randomized, placebo‑controlled pilot in overweight adults. L‑carnitine plus increased activity led to significant body‑weight reduction and lower triglycerides compared with non‑motivated placebo participants.
    View study
  6. Supplementation of L‑carnitine in athletes: does it make sense?
    Narrative review summarizing athlete studies where L‑carnitine increased peak oxygen uptake, shifted fuel use toward fat, and reduced exercise‑induced lactate, supporting its role in exercise performance.
    View paper
  7. Effect of the administration of L‑carnitine on body weight and metabolic parameters in patients with obesity
    Clinical trial registration describing the use of L‑carnitine for body‑weight and metabolic support in people with obesity, based on prior evidence for enhanced fat degradation during exercise.
    View trial record

Shilajit: Human Research

  1. Clinical evaluation of purified Shilajit on testosterone levels in healthy volunteers
    Randomized, double‑blind, placebo‑controlled trial in healthy men aged 45–55. 250 mg of purified shilajit twice daily for 90 days significantly increased total and free testosterone and DHEAS compared with placebo.
    View study (PubMed)  |  Full text
  2. Human studies of shilajit on fatigue, strength, and hormonal support (summary with RCT references)
    Overview article compiling randomized and pilot trials where 250–500 mg/day shilajit supported exercise performance, fatigue resistance, and hormonal health in adult men.
    View overview
  3. Evidence summary of shilajit and testosterone
    Consumer‑facing review that discusses a randomized, double‑blind, placebo‑controlled trial in 96 participants, highlighting significant increases in total testosterone with purified shilajit supplementation.
    View evidence summary

Manuka Honey (Supportive Ingredient): Human Research

  1. The effects of Manuka honey on plaque and gingivitis
    Randomized, controlled trial where chewing Manuka honey products significantly reduced plaque scores and gingival bleeding compared with controls, supporting Manuka honey’s oral health benefits.
    View study
  2. A randomized placebo‑controlled trial of Manuka honey for radiation‑induced oral mucositis
    Clinical trial evaluating Manuka honey as a supportive therapy for mouth soreness during head and neck radiotherapy, highlighting its unique soothing and antimicrobial properties in a medical setting.
    View study
  3. Honey for acute cough in children — a systematic review
    Systematic review of randomized controlled trials showing that honey can reduce cough frequency and improve sleep in children with upper respiratory infections compared with placebo or usual care.
    View review

These third‑party studies are provided for educational purposes only. They do not represent specific claims about Nutrive® products. Our products are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary.