Proline, glycine, and hydroxyproline are the primary building blocks of collagen
Some types of seaweed such as nori and dried green and purple seaweed are also rich in vitamin B12 and act as plant-based sources of this vitamin

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doi: 10.1093/ndt/gfv459 202 MullerLMGorterKJHakEGoudzwaardWLSchellevisFGHoepelmanAIet al