Both the original ProBoost powder packets and the new ProBoost 1 tablets feature our patented active ingredient, Thymic Protein A (TPA), which continues to be produced at only one laboratory in the entire world. While the traditional ProBoost packets contain 4 micrograms of TPA per packet, the ProBoost 1 tablets contain 1 microgram (hence the name, ProBoost 1) per serving.
Additionally, the ProBoost 1 Zingers and Orange Burst flavor contain both vitamins C and D.