I wish I could find some! One source told me raws have been unavailable for a long time… I do have some injectable M-stem which makes a very potent preworkout.
Both primo and stenbolone are derivatives of DHB. The c2 methylation of stenbolone offers greater resistance to 3α-HSD1 than the c1 methylation of primobolan, which was added (originally to the acetate ester) to increase oral bioavailability; it does so with less toxicity than c17-methylation, but also reduces its potency.
The c2-methylation of DHB is analogous to masteron/drostanalone~DHT, while the c1-methylation is analogous to Proviron/mesterelone~DHT. Proviron is not anabolic in skeletal muscle so the c1-methylation is not an effective deterrent to 3α-HSD; whatever anabolism primobolan has is derived from the λ1-testosterone A-ring.