I buy Amazing Grass from Roots, but it's on Amazon.

https://www.amazinggrass.com/store/?gclid=Cj0KCQjwmPPYBRCgARIsALOziAM3oBOV_FIFq9gMKZZSglHMmH3khwP9i-PHMvIZCS_Xy8C57pFFnyIaAhV0EALw_wcB

I use Horsetech for my horse’s spirulina. My biologist BF says theirs is most reputablt sourced. Good luck!

Can anyone recommend a good spirulina powder from a company they trust. I am vegan and really looking to up my protein and some other nutrients. I want a clean source from a reputable company.