What people try
4ExerciseStage 4 · Widely recommended · Free, for almost everyoneExercise is anything that gets your body moving.Main risk: Using weight machines improperly can cause back injury.3Vitamin DStage 3 · Large studies in people · Over-the-counter supplementVitamin D is a fat-soluble vitamin found in a few foods, added to others, sold as a supplement, and made by skin in sunlight.Main risk: Blood levels above 125 nmol/L (50 ng/mL) can be linked to harmful effects.3Testosterone therapyStage 3 · Large studies in people · PrescriptionTestosterone therapy uses man-made testosterone to treat low testosterone, and it can be given as a pill, gel, patch, injection, or implant.Main risk: The page lists several risks of this therapy, including infertility, an enlarged prostate, blood clots, and worsening heart disease.2CreatineStage 2 · Small studies in people · Over-the-counter supplementCreatine is a compound stored in your muscles that supplies them with energy.Main risk: Creatine can cause weight gain because it tends to make the body hold water, but it is otherwise considered safe for healthy adults.2GlyNAC (glycine and NAC)Stage 2 · Small studies in people · Over-the-counter supplementsNAC is used as a drug for acetaminophen overdose and to help break up mucus.Main risk: The pages list stomach upset, diarrhea, nausea, vomiting and similar problems as the common side effects of NAC.
Products
Sorted by the best research stage of each product's ingredients, then by price. The stage describes research on the ingredient, not proof that the product works.
Supplements
Vitamin D3 2000 IU (50 mcg) SoftgelsVitamin D3 Ingredient research: large studies in people$10.99Vitamin D3 2000 IU (50 mcg) TabletsVitamin D3 Ingredient research: large studies in people$11.29Vitamin D3 2000 IU (50 mcg) GummiesVitamin D3 Ingredient research: large studies in people$11.69Vitamin D3 + K2 - 5,000 IU, 30 capsulesVitamin D3 Ingredient research: large studies in people$16.95Zero Sugar Vitamin D3 GummiesVitamin D3 Ingredient research: large studies in people$18.99Vitamin D-5,000 - NSF Certified for Sport - 60 ServingsVitamin D3 Ingredient research: large studies in people$20Vitamin D + K2 LiquidVitamin D3 Ingredient research: large studies in people$34Vitamin D-5,000 - NSF Certified for Sport - 120 ServingsVitamin D3 Ingredient research: large studies in people$39Micronised Creatine PowderCreatine2 Ingredient research: small studies in people$14.99Creatine [+]Creatine2 Ingredient research: small studies in people$16.99Pure Glycine - 1000 mg, 120 capsulesGlyNAC (glycine and NAC)2 Ingredient research: small studies in people$19.95Micronized Creatine PowderCreatine2 Ingredient research: small studies in people$20.49Pure N-Acetyl Cysteine - 600 mg, 120 capsulesGlyNAC (glycine and NAC)2 Ingredient research: small studies in people$22.95GlycineGlyNAC (glycine and NAC)2 Ingredient research: small studies in people$31Creatine - Travel PacksCreatine2 Ingredient research: small studies in people$36Glycine + NAC PackGlyNAC (glycine and NAC)2 Ingredient research: small studies in people$38.95Creatine - 90 ServingsCreatine2 Ingredient research: small studies in people$42.99Creatine - 90 ServingsCreatine2 Ingredient research: small studies in people$44Longevity Creatine Pure Powder - 450 gramsCreatine2 Ingredient research: small studies in people$49.95Longevity Collagen Complete Powder - 690 gramsGlyNAC (glycine and NAC)2 Ingredient research: small studies in people$59.95NAC - N-Acetylcysteine - 180 ServingsGlyNAC (glycine and NAC)2 Ingredient research: small studies in people$63Creatine+Creatine2 Ingredient research: small studies in people$70Creatine - 180 ServingsCreatine2 Ingredient research: small studies in people$84
Recent research
Tiny particles and microRNAs may link exercise to brain aging
This review looks at small molecules carried in body fluids that may help exercise affect the aging brain.
Study compares muscle tiredness in younger and older adults and tests strength training
Researchers plan to compare younger and older adults to learn why leg muscles tire faster with age.
Can light weight training with blood flow limits help colon cancer survivors with muscle loss?
This is a trial plan that has not reported results yet.
Testing a traditional Chinese exercise against resistance training for muscle loss
This is a plan for a study, and it has not started recruiting people yet.
Testing balance and walking after a 4-week AI-guided exercise program
This study plans to check balance, walking, and brain activity before and after 4 weeks of exercise.
This is general information gathered from the sources listed, not medical advice. Talk to your doctor before starting anything new.