Updated 2026
Even if you don't normally take vitamins, pack some for the days immediately following long flights. Air recycled for 8, 14, or 20 hours puts your immune system in a vulnerable state. You're breathing the same recycled air as 300 other people. Colds and viruses spread efficiently in that environment.
Post-flight is when travelers catch colds. Your body is tired, your immune system is stressed, and you're exposed to pathogens from around the world. A boost of vitamin C immediately after landing can help.
Ways to get vitamin C while traveling:
- Tablets (pack a week's supply): Cheap, light, no-hassle
- Orange juice: Available everywhere, works instantly, tastes good
- Local fruits: Citrus, guava, and other fruits are excellent sources
- Supplements: Gummies, powders, or chewables
The dosage that matters: 1,000-2,000mg of vitamin C per day for 3-5 days after flying. That's higher than the recommended daily amount, but the science supports immune boosting for travel stress.
Other post-flight immune support:
- Sleep. Your body repairs during sleep. Prioritize it.
- Hydration. Drink water constantly. Airplane air is dry; your mucous membranes suffer.
- Hand washing. Wash hands after touching any shared surface.
- Avoid touching your face. Viruses enter through eyes, nose, mouth.
You can't eliminate the risk of catching something, but you can reduce it. Vitamin C, sleep, and hygiene are basic travel medicine.