It is much stronger than primo. Tough to put an equation between them and I think it's different for certain effects. In terms of actual muscle accrual, I suppose 1:2.5 or 1:3 is a decent approximation. However, if comparing strength gains then I think the 1:5 or 1:6 isn't out of the question. Primo seems to only benefit strength from accelerated recovery from additional volume and progression. DHB starts adding strength independent of volume by end of week 2. The neural stimulation is nowhere near comparable between the two. Other things that are very hard for me to equate between them are general feel and health. Primo doesn't do much to my lipids, nothing to my BP or RHR and not much in terms of general daily energy or feeling. On the other hand, DHB doesn't ding my lipids much either but it raises my CRP more than any other injectable I've ever used. Normally, my CRP will come back at 0.5-2.0. Obviously higher end while on cycle. But with DHB in the mix, it was over 10.0. Freaked me out a bit. Also, DHB seems to induce a bit of lethargy over time. Not certain why but it is what I've noticed.