As with all supplements, the Food & Drug Administration does not monitor moringa, so a person cannot be sure of its purity or quality
Collagen consists of 13.0 proline, 9.01 4-hydroxyproline, 0.09 3-hydroxyproline, and 33 glycine residues per 100 amino acid residues (or 13.3 g proline, 10.73 g 4-hydroxyproline, 0.11 g 3-hydroxyproline, and 25.8 g glycine residues per 100 g collagen)
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Effects of an Oroxylum indicum Extract (Sabroxy) on Cognitive Function in Adults With Self-reported Mild Cognitive Impairment: A Randomized, Double-Blind, Placebo-Controlled Study
Montvale, NJ: PDR Network (2013)
These may be due to heterogeneity across studies and meta-analyses