I've been using kapla products since 2018 and never had a doubt about the quality of their products. I've always seen gains with their test products. I use it mainly for my trt since its gotten expensive to have a prescription for it through a physician. I always use test. Cypionate at 250mg per week. After running for a month, I had my free and total testosterone checked. Since I work in a lab I can run my blood results regularly. Anyway, when running 250mg per week my free testosterone has gone from 6 to 20% with a total testosterone of 700 - 800. I'm pretty sure kapla puts out quality products.