ProBoost Thymic Protein A (TPA) Capsules are formulated to support healthy immune function as part of your daily wellness routine. Each serving provides 4 mcg of Thymic Protein A in delayed release capsules designed to bypass the stomach and dissolve in the intestine. For over 30 years, ProBoost products have been used by individuals seeking high-quality immune support supplements with carefully controlled manufacturing and simple formulations. This capsule formula contains organic rice flour and is free from collagen peptides. Manufactured in the USA. 30 delayed release capsules per bottle.