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Collagen is essential for maintaining skin elasticity and firmness, giving your complexion a smoother and more youthful appearance

Since the amount of the marker compounds that have been administered orally is known and the markers are not substantially metabolized during the study period, their urinary excretion is expressed as a percentage of the administered molecule ingested

DOI: 10.1371/journal.pone.0173722

The ketogenic diet is contraindicated in both of these phenotypes, because CACT deficiency impairs the conversion of long-chain fatty acids into energy, and the KD is a high-fat dietary pattern

PLoS ONE 2015