https://www.nhs.uk/live-well/healthy-body/body-building-sports-supplements-facts/
Protein is an important part of our diet and key to building and maintaining all types of body tissue, including muscle.
It contains amino acids, the building blocks used for muscle growth.
Protein powders, available as shakes, bars and capsules, are one of the most popular muscle-building supplements.
They're legally available to buy over-the-counter as well as online.
They're marketed as helping to promote your body's muscle growth, aid metabolism (helping with weight loss), help you reach peak physical performance, boost energy and fight the ageing process.