Protein supplements, such as protein powder, are a source of high quality protein. Proteins are important for muscle growth and recovery after workouts. They can be useful if you find it difficult to get enough protein from regular food. Protein supplements usually contain about 20-30 grams of protein per serving.

Gainers, or "mass gainers," are products specifically designed to increase body weight and gain muscle mass. They usually contain a combination of carbohydrates and proteins in specific proportions, as well as additional calories. Gainers are for those who have high energy needs and find it difficult to get enough calories and nutrients from regular food.

When choosing between a protein and a gainer, consult a nutritionist or sports medicine specialist. They can help determine your needs, goals and recommend the best option for you.