This formula's own materials describe a specific requirement worth understanding: email support and return all products, including empty bottles, for a full refund.
Full 60 days from the date of your purchase to decide, and if not satisfied, email support and return all products — including empty bottles — per this formula's own materials.
Keep all bottles, even empty ones, until you've decided whether to keep the product, and email support within the 60-day window rather than assuming a refund happens automatically.