Both beautiful compounds. I get the same gains from both. Primo needs to be used for 16+ weeks and high volumes. After 16 weeks I notice daily changes in my physique. I'll probably at some point run primo year round. Aids in lowering bf too.Originally Posted by Tron3219
Mast does similar, I run prop for 8 weeks and it gives a marbleizing effect to the skin. Really amazing look. You won't recognize yourself in the mirror. I'm running both now.