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Plant-Based Diets: Vegans and vegetarians often require injections because B12 is almost exclusively found in animal-derived foods

Gastrointestinal disturbances with B12 supplements typically relate to excipients such as sorbitol, mannitol, or lactose rather than the vitamin itself

Additional findings indicate potential benefits in experimental gastrointestinal injury models, including attenuation of inflammatory responses and enhanced mucosal resilience (2)

related full-length recombinant thymosin beta-4 (a different formulation than the marketed TB-500 fragment) has also been examined in small human studies for cardiac and dermatologic indications Examined in preclinical models, including diabetic rat Achilles tendon and rat ligament-injury studies, for actin-binding, cell-migration, and angiogenic activity that researchers have proposed as a mechanism for tendon and ligament repair, though this literature remains comparatively sparse for musculoskeletal applications specifically Known risks and side effects: Because TB-500 is manufactured and sold without FDA oversight as a "research chemical," independent testing and industry reporting describe wide variability in purity (with some products measured well below labeled potency) and contamination with heavy metals or bacterial byproducts, unlike pharmaceutical-grade recombinant thymosin beta-4 used in registered clinical trials Thymosin beta-4's core mechanisms, angiogenesis and cell migration, are also pathways exploited by tumors