Eighteen adult, female New Zealand white rabbits, all physically normal and weighing an average of 2.5 kg, were used
In 2021, Jung et al., in Korea, investigated whether the oral intake of enzymatically decomposed collagen peptides (acid-processed collagen peptides [APCPs]: 1000 mg suspended in 25-mL samples administered once per day) could improve skin moisture and barrier function by assessing changes in the ceramide and natural moisturizing factor (NMF) contents in the stratum corneum (SC), comparing baseline parameters to end-of-treatment parameter values [37]
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doi: 10.1073/pnas.1922184117 196
So the agency can't even write a quality standard for it because it can't say what "it" is