It's being slandered as horse paste because that's the form that's more accessible to regular people. To get the form of it made for humans, you need a doctor to prescribe it and a pharmacist to dispense it. Even if you get a doctor and pharmacist onboard, the government and regulatory organizations are watching and willing to revoke their licenses.

But there's no prescription required to buy the horse paste, and it has the same active ingredient.

The second part of the slander is saying how all of these people got sick from horse paste and called poison control. That happens if you take a dosage for a 1200 lb horse (the whole tube), but if you only take 10% of that amount, then you have enough for a 120 lb human. So these slanderous articles are implying that because this is made for horses, that's what makes people sick, and they're completely glossing over the fact that the sick people took a horse-sized dose.