Artificial version was denied by the FDA I believe https://www.theguardian.com/environment/2020/may/31/crab-blood-to-remain-big-pharmas-standard-as-industry-gro

Artificial version was denied by the FDA I believe https://www.theguardian.com/environment/2020/may/31/crab-blood-to-remain-big-pharmas-standard-as-industry-group-rejects-substitute https://www.theguardian.com/environment/2020/may/31/crab-blo... Unless it has since been reversed?