copper peptides help reduce irritation, and many people suffer from increased irritation caused by other topicals, such as minoxidil, spironolactone, etc. I don't really categorize copper peptides with that group because its so unlike other "hair medicines." For instance, I use it to reduce scalp irritation, not to regrow hair. There are no sides. You're not strapped to a rigid application schedule, like you are with other topicals. And You don't need a prescription. In fact, it's so easy and harmless to use, i recommend everyone give it a shot.
But yes, if you want to be technical, ac is a "topical" because you apply it to your scalp rather than ingesting it. But if you want to be technical, I use several other topicals as well . . . shampoo, conditioner, and hair gel. Neither of these are regrowth medicines, but like copper peptides they help foster a healthy scalp environment.
i recommend a copper peptide, even if you don't use other topicals. it's great for your scalp and hair. also, i find ac has a slight hold, so a few spritzes in the morning not only boosts my scalp health for the day, but it replaces the need for any hair product.