Here is a direct comparison to help you and your provider choose
The tissue-specific distribution of beta-3 receptors (concentrated in fat tissue) further enhances selectivity
Injectable Protocol (IM/SubQ) Intramuscular and subcutaneous glutathione injections are the most common non-IV route documented in functional medicine literature

Note: TB-500 is far less studied than full-length Thymosin -4, and the following effects are primarily supported for the parent compound: Actin Binding: Sequesters G-actin monomers, regulating cytoskeletal dynamics essential for cell movement (PMID: 22074294 - Thymosin -4) Cell Migration: Enables endothelial cells, keratinocytes, and other repair cells to migrate to injury sites (PMID: 22074294 - Thymosin -4) Anti-inflammatory: Reduces inflammatory cytokines and promotes resolution of inflammation (PMID: 30116499 - Thymosin -4) Matrix Metalloproteinase Regulation: Modulates tissue remodeling enzymes for proper scar formation (PMID: 16607611 - Thymosin -4) Stem Cell Recruitment: May enhance mobilization of stem cells to damaged areas (PMID: 22074294 - Thymosin -4) Complementary Action: BPC-157 establishes the blood supply (angiogenesis) needed for healing, while TB-500 facilitates the cellular migration and tissue remodeling that follows

They are worth considering for those wanting to improve their heart health
A few commenters pointed out that, as proposed, there will be varying amounts of data available as hospitals negotiate contracts at different times