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The compound received FDA GRAS status for safety but was never approved as a drug because efficacy was insufficient for pharmaceutical registration

PRP may be an effective therapeutic option for patellar tendinopathy, but the results are mixed and depend on patient characteristics, disease severity, and the PRP administration methodology

doi:10.2174/0929866053406084 Bankovi J, Andr J, Todorovi N, et al

While it is not a controlled substance, and its use is common in clinical and home care settings, federal law mandates that it be labeled and sold as Rx only. Always obtain bacteriostatic water from a licensed and reputable source, and use it strictly as directed under medical guidance