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The result is that gut absorption and plasma (blood) bioavailability studies comparing citrulline and arginine have shown two things

[DOI] [PubMed] [Google Scholar] Schweighauser M., Shi Y., Tarutani A., Kametani F., Murzin A
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Metaxas C, Mathis D, Jeger C et al (2017) Early biomarker response and patient preferences to oral and intramuscular Vitamin B12 substitution in primary care: a randomized parallel-group trial

Some 503A pharmacies may still dispense TB-500 under their state's interpretation of current regulations, while others may have paused compounding until the PCAC review is complete
