I've done some research in the area because we just released SLINShot at Purus Labs a couple months ago. Basically really quick it goes like this...
Carbohydrates are converted to glucose when we eat them in order to be used as fuel in the brain, muscles, etc; the stored form of glucose is called glycogen which is stored in the muscles and liver. When we eat carbs our blood sugar naturally rises in response, and our pancreas releases insulin to regulate our blood sugar, driving the glucose into muscle cells or fat cells. Obviously we want the carbs we eat (glucose) to be stored in our muscles as glycogen rather than as fat. The studies we did on SLINshot lowered postprandial (after you eat) blood glucose levels by an average of 21.5% based on our University lab work.
Theoretically, this means more of the glucose is being shuttled into muscle cells,
especially immediately post workout when they are depleted of glycogen (stored glucose). This also prevents post-meal hyperglycemia (blood sugar spikes) which can cause body fat storage and the production of harmful free radicals damaging cells. It also increases the absorption of nutrients such as amino acids, making any other supplements you're taking concurrently (post workout shake, creatine, BCAA's, etc) more effective.
In a nut shell SLINshot increases nutrient absorption (clinically proven), enhances
muscle glycogen storage (hugely important post workout), and can aid in repartitioning by lowering post-meal blood glucose allowing for less body fat storage.
Glucophage is a stronger memetic than SlinShot as it's a prescription drug. The studies we did on Gluco lowered postprandial blood glucose levels by an average of 40% with our test subjects. We were really pleased with an over the counter herb gave half the results as the prescription drug.