What Is It: BSN made Clean Creatine for NCAA Approved athletes and all other athlete tests. This safe formula will increase strength, build muscle fast, and speed up muscle recovery from soreness
At least 5 grams of creatine daily has been shown in hundreds of studies to improve muscle strength and size both long and short-term. 
This is the most basic and popular form of creatine. It’s simple to use and has the most clinical research to back it up. It’s unquestioned in the athletic world for its benefits.
Anhydrous simple means without water, and creatine anhydrous is supposedly the most “pure” form of creatine available.
However, basic creatine monohydrate is already free of water, and there aren’t any studies showing a benefit to using creatine anhydrous over any other form.
Magnesium Creatine Chelate
This is a patented form of creatine also known as Creatine Magna Power. It’s relatively new and is claimed to be the most advanced creatine ever creatine.
It’s simply a combination of creatine and magnesium, which is supposedly more beneficial than plain creatine. The manufacturer claims this combinations halts the conversion of creatine into useless creatinine, preserving more creatine in the body.
The manufacturer also claims that including magnesium further accelerates the creation of ATP.
The first claim is true. During transportation to muscles, a certain amount of creatine is lost, and binding it to magnesium has been shown to preserve it. 
However, I was unable to find many studies examining magnesium creatine chelate, so we’re unable to say if it offers a significant advantage over traditional creatine forms.
Betaine is a common compound that has been shown to improve the synthesis of protein and absorption by muscles. 
This is another patented blend and contains astragalus and panax notoginseng.
The manufacturer claims several studies have shown that AstraGIN increases the rate at which other ingredients, including amino acids, are absorbed by the muscles, improving exercise recovery.
Unfortunately, while these studies are touted on the official website, with accompanying graphs, there is no information on where the studies were published. I am also unable to find a single real study about AstraGIN, which makes me wonder if the company is being honest about this research.