3. L-Carnitine
L-carnitine is responsible for helping the body produce energy, meaning that it’s important for muscle movement as well as circulation. It also improves brain function and keeps the body healthy. L-carnitine is often used to treat muscle disorders, organ disease, and high thyroid levels. The safest way to take L-carnitine is through oral consumption via pills, tablets, or capsules. It is one of the safest amino acids to take as a supplement despite its importance. Due to this, it is easily categorized as one of the 5 most important amino acids for muscle growth and hair loss.