With the CJC/Ipa blend, the vial is 10mg total, and my lot averaged out around 6.2mg CJC and 4.6mg Ipa. Regardless, I put in 3ml of bac and give it time to dissolve. That's easier than the 20mg bottle of 10/10 BPC/TB4, though that dissolves too eventually. Once dissolved I pull it into a fresh syringe, fit a filter plus a fresh needle, and push it through into a 3ml pen cartridge. People trash blends because they're inflexible. My view: unless someone collects hard repeatable data, I really doubt that tweaking TB4 and BPC dose, timing or frequency changes much for my shoulder recovery. Anyone claiming otherwise mostly goes on feel, some rat study, or an internet personality selling access to their wisdom. A blend kit lets a beginner test several things without mixing four separately.