After entering your trip you get your jet lag plan. But where is the melatonin? 

As melatonin will always be taken in connection with sleep, the melatonin pill is shown as part of the sleep track and will look like this:

If the melatonin icon shown above is not used in your plan it means that your trip does not require the use of melatonin. Not all timeshifts require melatonin.

Find more information about melatonin and which kind you need to get prior to your trip here: https://www.timeshifter.com/melatonin-for-jet-lag