Not “hardcore” like ‘roids – We have to accept that the male body will only be able to produce a limited amount of testosterone. As boosters are not steroids, they don’t actually inject the hormone into the body. Steroids for gaining muscle mass (anabolic steroids) are illegal in most countries and should only be used under the guidance of a trained medical professional, and only to treat serious medical or health related issues. Of course, steroids can work extremely well for testosterone , at the expense of some horrible side effects. The point is, even though they are effective, you shouldn’t expect T-boosters to share the extreme effects of anabolic steroids – so if that’s what you’re going after, look elsewhere. More on testosterone boosters vs. steroids
Third, GH may influence the activity of IGF-1 on an autocrine/paracrine level. Autocrine means that a hormone has an effect on the cell that produced it, paracrine means to have an effect on the “cell(s)” next to it as well. This is a completely localized effect, not dependent on the blood stream to carry things where you want them. Muscle growth from weight training is the result of IGF-1 being produced by the muscle cells themselves, not the liver. In fact, IGF-1 form the liver is genetically different from IGF-1 produced in your muscles. This information should explain why using IGF-1 systemically (from the blood stream) has been a hit and miss proposition.