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was briefly on WADA watch list TB-500 Not approved Prohibited Research use only Thymosin Alpha-1 Not approved in US Permitted Approved in some countries (Italy, China) Ipamorelin Not approved Prohibited Research use only Key point: None of these compounds are FDA-approved for human therapeutic use in the United States

Local administration of growth hormone stimulates tendon collagen synthesis in elderly men

The 'growth factor' framing was the original description, before the copper-binding role of GHK was fully recognized

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