Q: Can I bring protein powder and dietary supplements through port security for my Yangtze cruise?

A:

Yes, protein powders and dietary supplements are generally allowed through port security, but they must be unopened or in their original packaging, and declared if in large quantities. Powder over 12 oz may require additional screening. Check China Customs for specific supplement restrictions.

From a plumbing and sanitation perspective, I care less about the supplements themselves and more about what happens to them downstream. If you're mixing protein shakes, don't pour leftover powder down the cabin sink—those fines grains clump in drain traps and combine with soap scum to form concrete-like blockages. Cruise ship greywater systems aren't built for thick slurries. Dump any unused mix into the toilet, not the sink.

Pack supplements in your carry-on if possible—checked bags get lost or delayed on riverboats with limited storage. Bring a sealed reusable shaker bottle; the ship’s tap water is potable but may taste metallic. And avoid any supplements with "detox" or diuretic claims—you don’t want to be racing for a vacuum toilet that handles solids like a kid with chopsticks.