Igennus® Vegan Pro-Collagen Protein Powder, 500g, 35 Servings. Igennus® Vegan Pro-Collagen closes that gap. Their PlantProColl® peptide blend, made from brown rice, pea, pumpkin seed and sunflower seed protein, is enriched with concentrated hydroxyproline, proline and glycine in a 2:1:1 ratio, mirroring the amino acid profile of actual collagen more closely than a standard plant protein powder.