Yeah, BA is a great solvent and I've used up to 10% w/ no probs, but the BB is needed as a co-solvent. It hydrolyzes to BA and benzoic acid, so it is a great choice as a cyp solvent. Look at the back of a vial of Depo, it has the exact ratio I suggested. It is needed. If you just use BA, especially with 1T cyp, it crashes hard after injected, and the depo properties are compomised IMO. That means poor biodistribution, BB also helps to thin it and has good preservative/anti-septic properties. I always use it in the ratios I said, except with 1T cyp when I use 1.5x as much BB as active. It helps with the pain big time to me.