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TB-500
The burned-in captions and transcript carry the scientific claims and their limitations. The visuals are conceptual illustrations, not validated molecular models or experimental images. The video has no voice or audio. The full explanation is visible on screen; optional accessible captions are available in the player.
Read every result in its study context. A cell experiment, animal model, exploratory analysis and controlled human trial answer different questions.
Prepared 05 November 2026. Regulatory status is jurisdiction- and date-specific. No claim of specialist review or exhaustive evidence coverage.
Transcript
Check the exact molecule
TB-500 and thymosin-beta-4 are often discussed as if every study tested the same thing. That shortcut can make the evidence look stronger than it is. [1] [2] [3]
Cell and rat research
Thymosin-beta-4 is involved in actin biology, which helps cells organize and move. Early wound research studied cell migration and wound repair in rats. [1]
Related names do not prove equivalence
A result for full-length thymosin-beta-4 cannot automatically validate a fragment or a product sold under another name. Sequence, purity, formulation, and clinical outcomes all need checking. [1] [2] [3]
Prohibited in WADA-governed sport
WADA’s 2026 list prohibits thymosin-beta-4 and derivatives such as TB-500 at all times. Neither laboratory activity nor a research-only label establishes a safe recovery treatment. [2]
Sources and context
These linked sources support the evidence distinctions in this short overview. This is not a systematic review, endorsement or treatment recommendation.
- Malinda et al. (1999): Thymosin beta4 accelerates wound healing →Keratinocyte migration and wound experiments in rats.
- WADA 2026 Prohibited List →Thymosin-beta-4 and derivatives, including TB-500, prohibited at all times.
- FDA 2026 PCAC briefing: TB-500-related bulk drug substances →TB-500 fragment identity, inconsistent commercial naming, and limitations on transferring full-length thymosin-beta-4 evidence.
