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.