Protein is a component of muscle.
The promotion of vitamin A is related to the regulation of gene by retinol, which is also a steroid hormone and can promote the synthesis of glycoprotein. Promote growth and development, strengthen bones, and maintain the health of hair, teeth and gums.
But I want to say that it is impossible to grow muscles just by eating without exercise.
And there should be reasonable physical exercise.
I wish you success!