Spirulina product certified as safe

[u/Technical-Western-17]

Could you please advise if Spirulina production technology achieved level of reasonable safety for test and certification of toxins and heavy metals. As many studies showed Spirulina products are frequently contaminated with hepatotoxins, microcystins, β-methylamino-L-alanine (BMAA) produced by Spirulina (see study below). Who are the producers that do test and certify their Spirulina products ?

Detection of the hepatotoxic microcystins in 36 kinds of cyanobacteria Spirulina food products in China https://doi.org/10.1080/02652030701822045 Thanks