Yes, you can take protein powder on Ryanair in 2026, but you should be prepared for additional scrutiny at airport security. Under current EU aviation safety rules, powders are permitted in both carry-on and checked luggage. However, for carry-on bags, security officers may treat large containers of powder (generally over 350ml/12oz) as "suspect" because they can obscure the view on X-ray scanners. A high-value strategy is to keep the powder in its original, factory-sealed packaging to prove its identity or to use smaller, clear travel containers if you are only bringing a few servings. If the powder is loose or in an unlabeled bag, it is a peer-to-peer "best practice" to remove it from your bag and place it in a separate bin for screening, much like you do with liquids. Ryanair itself has no specific "powder ban," but if your tub of whey protein is too large and puts your bag over the "small cabin bag" size limit, they will charge you a hefty gate fee to check it into the hold.