The main ingredient in protein shakes is of course-protein. Therefore, it is important to know the main function of proteins. The body requires protein for the purpose of building muscles, repairing muscles, fight infections etc. Proteins also make sure that the blood gets enough oxygen. The amount of protein that you need on a regular basis depends on your body weight, age and gender. However, on an average, a majority of teenagers should not consume more than 50 grams of protein on a daily basis. For specific results, carry out the following calculations:
*For teenagers between the ages for 11 and 13- Multiply .455 with your body weight. Make sure that this weight is in pounds.
*For teenagers between the ages of 15 and 18, multiply 0.36 with your body weight in pounds.

These above mentioned figures are mere estimates and if you indulge in increased physical activity, you may require more protein.  

Today, protein supplements are available and quite popular, especially with teenagers who wish to build muscle. They come in the form of powder, bars and shakes. While protein is definitely required for the purpose of building muscle, the fact is that this protein can be consumed by eating a good home cooked meal. Most protein shakes today are consumed by teenagers who wish to lose weight or gain muscle. They should not make the mistake of replacing meals with these shakes as this can prove to be quite risky with respect to their overall health. If one is looking to lose weight, protein shakes can be consumed between meals to keep hunger at bay and therefore to eliminate unnecessary snacking.
Protein shakes are actually extremely high in calories, therefore, teenagers should be careful about the way they plan out their diet if they want to indulge in these meal replacement drinks. The fact is that teenagers do not require protein shakes as it may stunt their development. Instead, formulating a healthy diet which consists of carbohydrates, proteins and fats is recommended. However, if it is absolutely necessary, you should consult a doctor before drinking such drinks as you could be allergic to some ingredients.
Most teenagers who indulge in strenuous physical activities are given the advice to drink protein shakes. However, it is important to know how much to drink and when to drink it. A number of protein shakes are available today that contain a healthy balance of protein, vitamins and minerals as well as carbohydrates. In such a case, “Ultrameal” is recommended for teenagers because it provides them with the necessary nutrients.
Many teenage girls also depend on protein shakes for the purpose of getting rid of extra fat. They should remember that while replacing one meal a day with such drinks is healthy, they should not go overboard.
The good news is that not only are protein shakes available quite easily but one can also choose from different textures and flavors. Naturally, each drink and each flavor offers a different benefit. Popular flavors like strawberry and chocolate are available as well. While some shakes combines proteins and vitamins, others combine proteins and carbohydrates. To know which combination to choose, you should keep your ultimate goal in mind.
In case you want to lose weight, look for a protein shake that promises to reduce hunger and increase the level of metabolism.

When you are looking to purchase protein shakes, make sure that you are aware of the ingredients in the drink. It is always better to choose natural ingredients over chemical additives. This is because natural drinks definitely taste better and have lesser negative effects.