The cycle product can get away with whatever they like. There are no regulations about labeling on fish products. The most you can ever hope to do is sue the manufacturer if the claims prove to be false but, all it would take to defend against such a claim would be to question you in depth on what exactly you did with the product and then somehow put you in the wrong.
Fish food claims are even worse. A person can list protein content as a simple percentage without saying that all of the protein is vegetable protein and incomplete protein at that. The categories usually listed can be bent and twisted in every fashion imaginable without outright lying and because there is no governing regulation, the simple fact that it is not an outright lie means you can do nothing about it. Unlike human food products, there is no law saying the main component, or the largest component needs to be listed first. Have a close look a food marked as an algae food. The first ingredient, if they happen to follow convention, is not likely to be any form of algae but a cereal grain product instead.
Unless you nurture a healthy skepticism, you will have more money spent per unit of benefit in this hobby than in most others. Completely unregulated industries are the haunts of the latest generation of robber barons. The fish hobby is such an industry so don't expect product claims like "can speed your cycle" to mean much more than "anything is possible, maybe you will get lucky".