Supplements and International Borders

Has anyone had experience taking supplements (protein powder, pre-peri-post workout powders, vitamin packs) through customs? I’m heading to Europe and don’t want to leave the muscle juice at home. I want to take my own since its relatively expensive to purchase over there.

I don’t mind getting screened at customs, I just don’t want to lose what I’ve paid my hard-earned money to purchase.

I’ve never had issues with anything packed in a checked bag.