Production chains for four injectable testosterone esters (propionate, enanthate, cypionate and undecanoate): androstenedione reduced to testosterone, esterified, recrystallized and compounded into oil-based vials. Doses build up simulated blood testosterone that boosts your mining and crafting speed; overshooting the target range aromatizes to estradiol, which costs crafting speed.
Mods introducing new content into the game.