Yes you can. But remember just taking Glycine by itself is just like taking vitamin A it may work but eating an apple would be a better source of Vitamin A.
The main bulk of an animal’s body consists of water, protein, fat and bones. Fat tissue and bone are metabolically more quiescent than the protein-water systems. During stress or starvation, or even hibernation, animals lose lean mass faster than fat.
The amino acids that constitute protein have many hormone-like functions in their free state. When our glucose (glycogen) stores have been depleted, we convert our own tissue into free amino acids, some of which are used to produce new glucose. The amino acids cysteine and tryptophan, released in large quantities during stress, have antimetabolic (thyroid-suppressing) and, eventually, toxic effects. Hypothyroidism itself increases the catabolic turnover of protein, even though general metabolism is slowed.
Other amino acids act as nerve-modifiers (?transmitters?), causing, for example, excitation or inhibition.
Some of these amino acids, such as glycine, have a very broad range of cell-protective actions.
Their physical properties, rather than their use for production of energy or other metabolic function, are responsible for their important cytoprotective actions.
Gelatin (the cooked form of collagen) makes up about 50% of the protein in an animal, but a much smaller percentage in the more active tissues, such as brain, muscle, and liver. 35% of the amino acids in gelatin are glycine, 11% alanine, and 21% proline and hydroxyproline.
In the industrialized societies, the consumption of gelatin has decreased, relative to the foods that contain an inappropriately high proportion of the antimetabolic amino acids, especially tryptophan and cysteine.
The degenerative and inflammatory diseases can often be corrected by the use of gelatin-rich foods.
That is just the tip of the iceberg.
Supplementing 10 grams of glycine with 30 grams of Glutamine is a great way to restore glycogen levels without eating sugar in a post work in order to drop body fat.
Also that protocol will help keep carb intake low when trying to cut weight without losing energy production during high intensity workouts. This will load the liver with glucose during low carb days (50g ? 100g)