Can you take protein powder from the UK to the US?
Protein powder: GOV.UK says UK cabin liquid rules depend on the departure airport: some allow containers up to 2 litres, others keep 100ml, and a clear bag isn't required everywhere. Check your airport; if its rule isn't confirmed, pack to 100ml. Protein powder is screened as a powder, not under the liquid limit; large containers may be opened or tested. The cabin rule at the departure airport in the UK is what matters.
Triple-check
Security · Airline · BorderCheck the airport security rule for protein powder before you fly.
At the checkpoint leaving the origin airport.
Check airline and baggage rules for protein powder on this route.
Cabin vs checked baggage rules.
Check the US import rules for protein powder.
Customs and import rules in the US.
Best packing plan
Cabin
GOV.UK says UK cabin liquid rules depend on the departure airport: some allow containers up to 2 litres, others keep 100ml, and a clear bag isn't required everywhere. Check your airport; if its rule isn't confirmed, pack to 100ml. Protein powder is screened as a powder, not under the liquid limit; large containers may be opened or tested.
Checked
Bulk protein powder can go in checked luggage. Checked luggage avoids the cabin liquid limit, but it doesn't change customs or food-import rules at your destination.
Border
Separate customs or import rules may apply when you arrive. Check official customs guidance for your destination.
Strictest play: Safest packing plan: keep individual containers at 100ml or less, or put the full-size item in checked luggage.
Source: UK GOV.UK national hand-baggage guidance applies as a fallback. Some UK airports allow larger liquids — check the specific airport page.
This answer covers the UK → the US. The rules can change depending on where you're flying from and to — check this item for your exact route.
Protein powder vs protein shakes
"Protein" can fall into different airport rule categories depending on the form you're carrying. Here's how security usually treats each one.
- Protein powder
- Treated as a powder/food/supplement at airport security — not a liquid, so the 100ml cabin rule does not apply. Large containers may be pulled for extra screening, and destination customs can still ask about supplements, dairy ingredients or commercial quantities.
- Ready-to-drink protein shakes
- Treated as liquids. Subject to the 100ml cabin-bag rule unless bought after security airside, or specifically allowed by the departure airport (e.g. an airport with CT scanners that permits larger liquids).
- Protein gels, puddings, yoghurt-style pots or creams
- Treated as liquids/gels/creams at security. The 100ml cabin rule applies even though they look like food. Put larger pots in checked luggage.
- Protein bars
- Usually treated as solid food at security and fine in cabin. Destination customs rules can still apply — some countries restrict meat, dairy or plant-based ingredients on arrival.
Triple-check reminder
- Security: powder is not a liquid, but ready-to-drink shakes, gels, puddings and yoghurt-style pots are — those follow the 100ml cabin rule.
- Airline: whether powder travels cabin or checked depends on the container size and your airline's baggage policy.
- Border / customs: supplements, dairy-derived ingredients and food imports can be restricted at the destination — check official guidance for the country you're flying into.
Liquid Limits focuses on airport security and liquid-like travel items. Separate customs, import, airline, or destination laws may apply. CBD, alcohol, medicine, food liquids, and dangerous goods may need official destination guidance beyond airport security. What this site covers and doesn't cover.
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Packing checklist for this trip
A short checklist for this trip — pack what you need to stay within the rules above.
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Frequently asked questions
Can I take protein powder from the UK to the US?
Protein powder: GOV.UK says UK cabin liquid rules depend on the departure airport: some allow containers up to 2 litres, others keep 100ml, and a clear bag isn't required everywhere. Check your airport; if its rule isn't confirmed, pack to 100ml. Protein powder is screened as a powder, not under the liquid limit; large containers may be opened or tested. The cabin rule at the departure airport in the UK is what matters.
Can I pack protein powder in cabin baggage?
GOV.UK says UK cabin liquid rules depend on the departure airport: some allow containers up to 2 litres, others keep 100ml, and a clear bag isn't required everywhere. Check your airport; if its rule isn't confirmed, pack to 100ml. Protein powder is screened as a powder, not under the liquid limit; large containers may be opened or tested.
Can I put protein powder in checked luggage?
Bulk protein powder can go in checked luggage. Checked luggage avoids the cabin liquid limit, but it doesn't change customs or food-import rules at your destination.
Do I need to declare protein powder at customs in the US?
Separate customs or import rules may apply when you arrive. Check official customs guidance for your destination.
LiquidLimits.com is a travel planning tool, not an official airport or government source. Rules can change between trips and between terminals. Always check the official airport or aviation security guidance before you travel, and when in doubt pack to the stricter 100ml cabin-bag rule.