It plays a role in energy metabolism, bone health, as well as brain, nerve, heart, and kidney function
Lipman R
With those caveats in place, here is what the data and community sources describe at each phase
Here are some key nutrients that, when deficient, can impact appetite and whose supplementation (potentially via injection for higher absorption) can help: Vitamin B1 (Thiamine) vital for converting carbohydrates into energy
Vitamin B12 injections are often recommended for individuals who are unable to meet their B12 requirements through diet alone, such as those following a vegan or vegetarian diet, individuals with malabsorption issues, or those with certain medical conditions
Intl Thymic Malignancy Interest Group, 2010