What's the best material for protein powder and supplement packaging?

The best material for supplement packaging is a high-barrier recyclable PE laminate with EVOH. It protects efficacy and flavour (OTR and WVTR of 3 or below), carries up to 70% GRS-certified recycled content, and recycles via soft-plastics collection. Foil delivers maximum barrier where genuinely needed, but it is not recyclable and we say so up front.