Buying Whey Protein Powder in Wengen or Lucerne

Yes, should be possible, though selection may not be huge.
For example: https://www.coop.ch/en/food/sweets-snacks/health-and-sports/proteins/vanilla-whey-protein/p/7107371
You can search availability by location on the website.

I checked the Coop website and searched for protein powder. It gave me a few choices including: Vanilla whey concentrate; chocolate whey concentrate; chocolate whey protein. I don't know if this is exactly what you are looking for.

https://www.coop.ch/en/locations/coop-supermarkt-wengen/1826_POS

Another option (especially if you have Prime) is to purchase what you are looking for from Amazon.ch and have it delivered to your hotel.

You might even just want to bring some with you. I bring enough instant oatmeal for 2+ weeks. That’s got to be heavier.

I thank you all for your suggestions. This is extremely helpful.

-Daniel

Be aware that the online coop shop is not the same as the walk-in shop. It is not at all unusually for some items to only be available online depending on the size of the walk-in store.

@Jim, simple way to check, since, as I mentioned, the Coop website does also give current availability of products in actual store locations. It’s always been accurate when I’ve used it (which is more or less every week). You simply select the “check availability in store” and put in the town or postcode. Makes it easy to confirm that a particular item is available in your preferred Coop.