Boulardii versus Cerevisiae

EquiBios and EquiOtic contain Saccharomyces boulardii, but the label says Saccharomyces cerevisiae… Why?

Per regulations, we cannot label with Saccharomyces boulardii, but we can use Saccharomyces cerevisiae. S. boulardii is a subspecies of S. cerevisiae. Two links below discuss Saccharomyces further.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1855594/

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5192264/