飛行機にクレアチンパウダーを持ち込める？（米国TSA・CATSA規則）

持込可：航空保安基準において機内持ち込み手荷物として問題なく持ち込めます。

受託手荷物：受託手荷物（預け入れ）として問題なく預けることができます。

Standard carry-on baggage size allowances apply; TSA publishes no individual numerical cap for personal use.

Yes. Major brands such as Optimum Nutrition Micronized, Thorne Creatine, BulkSupplements must comply with standard security limits based on physical properties rather than brand labels.

Yes. Creatine is a powder, not a liquid, so the 3.4 oz rule does not apply. Up to 12 oz (350 ml) passes normally; containers above that go in a separate X-ray bin for extra screening.

No — dry powders are exempt from the liquids rule. They instead fall under the separate 12 oz / 350 ml powder-screening rule in the US and the 350 ml/g total limit in Canada.

Security treats it like any powder. Sealed retail packaging is the smooth route through both screening and customs at agricultural-strict destinations; unmarked bags of loose white powder invite questions everywhere.