Which vitamin is synthesized in the body and supports the metabolism of proteins and fats?

The vitamin that is synthesized in the body and plays a crucial role in the metabolism of proteins and fats is Vitamin B-5, also known as pantothenic acid. This vitamin is vital for synthesizing coenzyme A, which is essential in the process of fatty acid metabolism and is involved in the Krebs cycle, where it helps convert carbohydrates into energy. Additionally, it assists in the breakdown of amino acids during protein metabolism, thereby contributing significantly to energy production and the overall metabolic process.

Other B vitamins have important roles as well, but they do not specifically highlight the synthesis and metabolic pathways to the same extent as Vitamin B-5 does regarding both protein and fat metabolism.