Spirulina is not algae. It’s bacteria. [0]

I avoid it, possible ALS risk.[1][2][3]

[0] https://en.m.wikipedia.org/wiki/Spirulina_(dietary_supplemen...

[1] https://en.m.wikipedia.org/wiki/Cyanotoxin

[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3295368/

[3] https://www.tandfonline.com/doi/abs/10.3109/1748296090327848...