This is what I found on their website: https://www.algaecal.com/algaecal-ingredients/lithothamnion-superpositum/

“Lithothamnion superpositum is a species of red coralline algae found off the South American coast. Taxonomically, it’s a red algae in the Rhodophyta phylum, from the Corallinales order (also known as Algas calcareas), the Lithothamnion genus, and one of the 103 species within that genus. You can read a description of each taxonomical step in the next section.

Since Lithothamnion superpositum is found in the Algas calcareas order- and the South American locals call the kiwi-sized balls of algae by the same name- we shortened it to “AlgaeCal”! So the unique strain of red algae used in every bottle of AlgaeCal Basic and AlgaeCal Plus is actually Lithothamnion superpositum.

And it’s this specific species of algae that’s behind the clinically documented bone density increases in people of all ages. Luckily, AlgaeCal has the worldwide exclusive rights to this particular algae species.”

It all sounds good but I know words and marketing are tricky.