From the article:
Using a structured review approach, Samplaski and a team of researchers explored the active ingredients and advertised claims of 50 T boosting supplements. Their findings were published as an original article in The World Journal of Men’s Health.
Of the 150 supplements, researchers came across 16 general claims to benefit patients, including claims to “boost T or free T,” “build body lean mass or muscle mass,” or “increase sex drive or libido.”
While 90% of the T booster supplements claimed to boost testosterone, researchers found that less than 25% of the supplements had data to support their claims. Many also contained high doses of vitamins and minerals, occasionally more than the tolerable limit.