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(Native, unmodified recombinant human IGF-1, sold as mecasermin/Increlex, is FDA-approved only for a narrow pediatric growth-failure indication and is chemically distinct from the LR3 analog.) In the US it is manufactured and sold almost exclusively as an unregulated "research chemical" labeled "not for human consumption," a labeling practice peptide vendors use to avoid marketing it as an unapproved drug

In two Phase 2 clinical trials covering stasis and pressure ulcers, TB4 accelerated complete wound closure by almost a month in patients who achieved full healing representing one of the most substantial healing acceleration outcomes observed for a peptide compound in a controlled clinical investigation

For B12 supplements, verify the active compound (e.g., Methylcobalamin) and concentration (e.g., 5000 MCG )

The absence of Phase III trial data means that overdose thresholds remain undefined by regulatory standards