Pills and capsules go in your carry-on
Tablets, capsules and softgels are solid. They are not covered by the liquids rule, so you can pack them in a carry-on without a size limit on the rule's account. Keep them in the bottles they came in, or in a pill case with a photo of the label on your phone. That way an officer, or you, can tell what each one is.
Carry them in your cabin bag, not your checked bag. Checked bags get delayed and lost. A week without your usual items is a bigger problem than a heavier carry-on.
A screener may still ask you to take a container out of the bag or open it. That is normal. Stay calm, answer plainly, and repack when you are cleared.
Liquids and gels: the 3-1-1 rule
The TSA lets you carry liquids, aerosols, gels, creams and pastes through the checkpoint in containers of 3.4 ounces (100 milliliters) or less. All of them must fit in one quart-sized bag. Anything larger belongs in checked baggage.
That covers liquid supplements, oil droppers, gel packs and gummies that have turned into paste in the heat. If a bottle holds 8 ounces, it cannot go through the checkpoint in your cabin bag, even if it is half empty. The size printed on the container counts.
The TSA lists medications as an exemption to the rule. That is about medicine, and the agency does not say a general wellness product qualifies. If you are unsure which side an item falls on, move it to your checked bag or buy a small travel size. Also, any item that alarms during screening gets extra checks, so a small bottle can still slow you down.
Powders: expect a second look
Protein, greens and electrolyte powders are not liquids, so the 3-1-1 rule does not apply to them. But a loose white or tan powder looks the same on a scanner as many other things, and officers may need to screen it further.
Powder rules differ by airport and by country. An officer may ask you to open a container, test the powder, or send the bag through a second scan. If the powder cannot be cleared, it may not be allowed in the cabin.
The practical advice is simple. Use single-serve sachets or a small, clear, labeled container. Put the bigger tub in a checked bag. Keep the powder near the top of your carry-on so you can pull it out fast.
Batteries and devices travel in the cabin
Many people carry more than supplements. Think of a smart scale, a wearable, a blender bottle with a motor or a power bank. The Federal Aviation Administration says spare lithium ion and lithium metal batteries, including power banks, must go in carry-on baggage only. Protect the terminals so they cannot short circuit, for example with tape or a small pouch for each one.
If a gate agent checks your carry-on at the door of the plane, take the spare batteries and power banks out first and keep them with you in the cabin.
Crossing a border: what customs asks
Screening at the airport is only half of the trip. When you enter another country, a customs officer decides what comes in. Customs rules differ by country. Some ask you to declare medicine and similar goods. Some limit the amount you can bring, and some ask for the original container or a note from a doctor.
Because the wording on many forms is broad, the careful move is to declare your supplements when the form is unclear, answer questions honestly, and let the officer decide. Carry only personal-use amounts, kept in original labeled containers.
Other countries set their own rules. Some limit certain ingredients or require permits for larger amounts. Read the customs page of your destination's government before you pack, and check it again the week you leave. Rules change, and a product that is a normal shelf item at home can be restricted abroad.
A simple packing list
- Keep products in original, labeled containers.
- Put pills and capsules in your carry-on.
- Move any liquid over 3.4 ounces to checked baggage.
- Use small, clear containers for powders and put big tubs in checked bags.
- Carry only what you will use on the trip, with a small spare.
- Declare supplements to customs when the form is unclear.
- Check the destination country's own rules before you leave.
One last point: this guide covers travel logistics only. Talk to a pharmacist or your clinician about whether a product is right for you, and about prescription items in particular.