Testosterone Base is 100% pure testosterone similar to aqueous Testosterone Suspension however Test Base is technically a solution not a suspension. Test Base contains no visible Testosterone crystals because they are in an oil and solvent solution NOT water. There are no crystals to slowly absorb into the injection site. Therefore when you inject Test Base there is a very rapid increase in blood Testosterone levels that falls off faster than standard aqueous Testosterone suspension. Test Base packs a big instant wallop when injected and is arguably the fastest Testosterone product available today.