I've had all really good experiences with Anabeta Elite, Erase Pro, and Triazole, also take a look at the science behind our test booster called ANS Fortitude. FeruTest is an exclusive ingredient that's contained in FORTITUDE. It's been clinically studied in both mice (mechanism of action) and humans for efficacy. The results summary is truly impressive.
FeruTest helps increase blood-flow to the testes. Measurements of increased nitric oxide and vasodilation, enhanced libido (>80% in humans) and in mice: penile erections and mounting tests all helped verify this.
One of the coolest things measured in the study was the improvement in sperm health parameters as a result of the increased testicular blood flow. Oligospermatic (below normal count) subjects were tested, and saw an increase is total sperm count and motility within 90 days (it takes 3 months for new sperm to mature). In our partnership with the group that did the study - they even shared that in some unpublished results, about 20% of men that were azospermatic (no sperm/sterile) were found to have a measurable amount of sperm (still low - but more than 0) after treatment.
While the results were not tied to an increase in Testosterone persay, it can be inferred that the improvement in testicular bloodflow, sperm health and increased libido could be tied to increased testosterone levels. But FORTITUDE has several other ingredients also studied in human and dosed effectively to help boost free test levels.