The availability of a perfect testosterone to use with Testosterone Phenyl Propionate was always an issue. We needed was a testosterone you can draw in the same syringe as NPP. That would release exactly like NPP. This was the biggest reason Testosterone Phenyl Propionate’s (TPP) development . TPP is slightly longer than Test Propionate but shorter than Testosterone Cypionate. TPP has the same ester as NPP and will elevate blood serum levels at exactly the same time.

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