Since this is explicitly an independent information resource, not the official seller itself, it's worth understanding the specific risk unauthorized third-party sellers carry when you go to actually place an order.
Listings from sellers not authorized by the brand may be counterfeit, expired, or mislabeled — a genuine risk in the nerve-health-supplement category specifically, worth checking carefully before you complete a purchase through any link.
Follow order links through to the official checkout, and be skeptical of significantly discounted listings on marketplaces or third-party sites claiming to sell the same product outside that official channel.