Isoleucine is an essential amino acid that the body needs for many different functions. It is important for protein synthesis, hemoglobin production, and energy metabolism. Isoleucine is also involved in the regulation of blood sugar and helps to heal wounds and repair tissue.

There are many different isoleucine supplements on the market, so it can be difficult to know which one to choose. To help you make a decision, we’ve done an in-depth comparison of two of the best isoleucine supplements available: NOW Foods Iso-Rich Soy Protein and Jarrow Formulas Iso-Opti.

Now Foods Iso-Rich Soy Protein is a soy protein isolate that is high in isoleucine and other amino acids. It is also high in fiber and low in fat and carbohydrates. This makes it a good choice for people who are trying to lose weight or build muscle. Jarrow Formulas Iso-Opti is an isoleucine supplement that is also high in other amino acids. It is designed to help improve athletic performance and recovery.

So, which is the better isoleucine supplement? Here’s a closer look at the two products to help you decide.

Price

NOW Foods Iso-Rich Soy Protein is available in a 2-pound tub for $19.99. Jarrow Formulas Iso-Opti is available in a 3.53-ounce bottle for $19.95.

Ingredients

NOW Foods Iso-Rich Soy Protein contains soy protein isolate, isoleucine, leucine, valine, lysine, methionine, phenylalanine, threonine, tryptophan, and glycine. Jarrow Formulas Iso-Opti contains isoleucine, leucine, valine, and glycine.

Effectiveness

Both NOW Foods Iso-Rich Soy Protein and Jarrow Formulas Iso-Opti are effective at providing the body with isoleucine. However, NOW Foods Iso-Rich Soy Protein is also a good source of other amino acids and is high in fiber. This makes it a better choice for people who are trying to lose weight or build muscle. Jarrow Formulas Iso-Opti is designed to help improve athletic performance and recovery.

Side Effects

NOW Foods Iso-Rich Soy Protein is unlikely to cause side effects. Jarrow Formulas Iso-Opti is also unlikely to cause side effects.

Conclusion

NOW Foods Iso-Rich Soy Protein and Jarrow Formulas Iso-Opti are both effective isoleucine supplements. However, NOW Foods Iso-Rich Soy Protein is also a good source of other amino acids and is high in fiber. This makes it a better choice for people who are trying to lose weight or build muscle. Jarrow Formulas Iso-Opti is designed to help improve athletic performance and recovery.