Advanced Testosterone Support

Advanced Testosterone Support is Thorne's entry in the crowded "test booster" aisle, and it is a deliberately short formula: 500 mg of shilajit extract, 150 mg of luteolin phytosome, 120 mg of a root-and-leaf ashwagandha extract and 15 mg of zinc as bisglycinate chelate, in two capsules once a day. There is no caffeine, no DHEA, no proprietary blend and no long tail of filler botanicals — every amount is printed on the panel.

The dosing is defensible rather than heroic. Purified shilajit has been studied in healthy men at roughly 500 mg a day over 90 days with modest changes in total and free testosterone, so this is the one ingredient at a dose matching its own literature. Ashwagandha at 120 mg lines up with high-withanolide concentrates used in some trials, but it is well below the 300–600 mg typical of root-only extracts such as KSM-66. Luteolin is included on the theory that it modulates aromatase activity; human evidence there is thin. Zinc matters mainly for men who are actually short on it.

Thorne's manufacturing story is the strongest part of the package: an A rating from Australia's TGA, cGMP compliance, an NSF-certified facility and four rounds of in-house and third-party testing. This particular SKU, however, is not one of Thorne's NSF Certified for Sport items, which matters if you are drug tested.

At the brand's $43 list price for 30 servings, it works out to about $1.43 a day — expensive for four ingredients, and priced on Thorne's quality reputation as much as on the formula itself.