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fragment-specific activity review: PMC8724243 TB-4 / TB-500 product mislabeling documented bidirectional mislabeling between full-length TB-4 (43 aa) and the TB-500 fragment (residues 1723) in marketed peptide products: Esposito M et al
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The NHS does not set an upper safe limit for B12 because harmful effects from excessive intake have not been definitively established
User experiences suggest meaningful benefits for gut healing applications where local peptide effects matter
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