Dr. Mike from Renaissance Periodization has released his data-driven analysis of the most overrated supplements in 2025 in a recent video. The results might surprise consumers spending billions on products that barely move the needle. Using purchasing data, search volumes, and discussion board activity, he identified the top 10 most popular supplements and ranked them by effectiveness for muscle growth and fat loss.
Dr. Mike’s approach was refreshingly scientific. He compared each supplement’s effects to gold standards: 5 grams of creatine monohydrate daily for muscle growth and 5 milligrams weekly of tirzepatide for fat loss over 12 weeks.
BCAAs (Branched-Chain Amino Acids)
This topped the overrated list despite generating $1.8 billion in 2024 sales. While BCAAs theoretically stimulate muscle growth through the mTORC1 pathway, they only provide marginal benefits when protein intake is inadequate. For anyone consuming adequate protein—about 0.75 grams per pound of body weight—BCAAs deliver a mere 12% of creatine’s muscle-building effect, adding approximately 0.3 pounds of muscle over 12 weeks.
Conjugated Linoleic Acid (CLA)
This ranked second, earning $231 million despite delivering disappointing results. While effective in rodent studies, CLA produces only 1.5 pounds of fat loss over 12 weeks in humans—just 14% of tirzepatide’s effectiveness—often accompanied by gastrointestinal upset.
Oral L-Carnitine
This came third with $220 million in sales. Though L-carnitine can transport fatty acids into mitochondria for oxidation, the oral form gets largely destroyed by gut bacteria before reaching muscle tissue. The result: 1.3 pounds of fat loss over 12 weeks, representing 12% of tirzepatide’s power.
Natural Testosterone Boosters
This dominated the market with $3.7 billion in sales while delivering virtually nothing. These herb blends containing fenugreek, tribulus, ashwagandha, and D-aspartic acid produced a measly 0.15 pounds of muscle and 0.2 pounds of fat loss over 12 weeks—representing just 5% of creatine’s muscle-building effect and 2% of tirzepatide’s fat loss capability.
Glutamine
Glutamine rounded out the list as the veteran disappointment, generating $267 million in sales for zero statistically meaningful changes in muscle or fat. Despite being marketed as a nitrogen donor and recovery aid, glutamine shows no direct evidence for muscle protein synthesis in healthy individuals with adequate nutrition.
These supplements persist in the market not because they work, but because they work just enough to technically claim effectiveness while delivering profoundly underwhelming results. As Dr. Mike noted, effective supplements like creatine, protein powder, vitamin D, and magnesium exist—they just didn’t make this particular list of disappointments.
Before spending money on supplements that promise dramatic results, consumers should focus on proven basics and realistic expectations. With billions flowing to products that barely register measurable effects, this analysis is a reality check for anyone serious about their fitness investment.
