Take some St. John's wort. It is thought to have a calming effect on the nervous system, according to Herbal Remedies Info. While its uses are numerous, it is commonly taken for both depression and pain relief.
Add rosemary oil to your travel arsenal. Taken as a tincture, with a few drops added to half a cup of water, rosemary acts as a stimulant, according to Himalaya Homeremedies. This will help you stay awake until it is time to sleep by your new area's clock. Sleeping according to your new time zone's clock helps to reset your internal clock.
Combat the effects of insomnia through the ingestion of chamomile before bed to fully recover from jet lag. Long held as a sleep aid, a cup of chamomile tea is also thought to settle the stomach.
Use Siberian ginseng. It is derived from the eleuthero plant and is an adaptogen that helps the body deal with stress by preventing adrenal burnout. It also boosts the immune system, an excellent preventative measure when traveling in confined quarters with others. Herbal Remedies Info suggests taking it in combination with vitamin C for increased effectiveness.