A buddy of mine works for GNC and has been in the supplement business for many years. Word on the street is that they're doing everything they can to shut down availability of NAC including buying up supplies and forcing supply chain distribution issues & shortages. Haven't heard anything about an outright banning yet but who knows. Sounds like maybe Quercetin, Zinc and D3 are in the crosshairs as well. I'm not surprised in the least bit. They're desperate. Everyone should replenish their personal stashes now before it's too late.