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Stool samples have the great advantage that sampling is non-invasive

Sechenov Medical Journal 14, 3141

Highly absorbable, long-lasting, and safer than high-dose oral supplements

As their names imply, the aromatic amino acids (phenylalanine, tyrosine, and tryptophan) contain an aromatic functional group, making them largely nonpolar and hydrophobic due to their high carbon-to-hydrogen ratio

However, the levels one obtains orally can vary depending on factors like digestion and individual absorption rates, which is where injections can sometimes come in handy

However, this effect was only seen in high-intensity exercises