Both have intriguing preclinical profiles but very limited human clinical data
It should be treated as an optional add-on after calories, protein, training, and sleep are already controlled
(2024) A Specific Collagen Hydrolysate Improves Postprandial Glucose Tolerance in Normoglycemic and Prediabetic Mice and in a First Proof of Concept Study in Healthy, Normoglycemic and Prediabetic Humans
The vitamin is found in seafood, meat, milk, and eggs, so vegetarians and vegans are at risk
World J Gastroenterol, 2017
L-Carnitine may also be discussed alongside related services, depending on what your provider deems appropriate for your body and goals