Controlled Labs Blue Up formulas potent extracts act in unison to help ignite your body's own mechanism for turning bound (useless) testosterone into free (useful) testosterone that is needed for muscle growth and pure power. This extra power translates into greater lifts and muscle growth. Key Attributes - Highest Potency - Patented LongJack - Increase free testosterone levels - Highest grade of Tribulus, Avena Sativa and LongJack available - Stimulant-Free for night dosing and Red Acid™ stacking Blue Up™ (Stimulant Free) is the most potent natural testosterone booster available. Most testosterone boosters claim to raise your testosterone; testosterone is a broad term. Raising total testosterone is not very helpful by itself, because the body needs testosterone in a free or unbound state to use it effectively for lean muscle mass and strength gains. The problem is that most men have plenty of total testosterone, but their free state testosterone is on the low side. SHBG (Sex Hormone Binding Globulin) keeps your body's testosterone locked up for potential use at a later time, but most men do not release enough of this bound testosterone naturally to make great gains. That is why we designed Blue Up™ (Stimulant Free) to help your body produce more total testosterone while simultaneously helping to unbind your existing testosterone by limiting SHBG in your system. The manner in which this formula operates hampers many of the side effects that were common with synthetic and older natural based testosterone enhancer use. So if you are looking to increase your free testosterone level and your strength in the gym, Blue Up™ (Stimulant Free) is the way to go. This formula's potent extracts act in unison to help ignite your body's own mechanism for turning bound (useless) testosterone into free (useful) testosterone that is needed for muscle growth and pure brut power. This extra power translates into greater lifts and muscle growth. Since Blue Up™ (Stimulant Free) does not contain caffeine or yohimbe you can successfully take it at night or with Controlled Lab's Red Acid™.