Like bufotenine, mescaline lasts for thousands of years. Don’t worry about shelf life.

The acetate kicks in maybe after 15-45 minutes, while the HCl takes usually 30-90 minutes. The acetate peaks at about 3 1/2 hours, while the HCl peaks at about 4 hours. The total duration is about the same, 12 hours or so. The acetate has a faster onset and faster peak and is slightly stronger at the start because of it. However, the texture is waxy, not powdery like the HCl, and it’s much harder to purify.

You can use non-food grade. Food grade (FCC grade or USP grade) is healthier for you. Always use food grade whenever possible.