I don't believe it leaves anything in your system, and if it did, it's doubtful anybody tests for it like they do THC in marijuana.
Ephedra is a herb that is used for weight loss purposes. How long ephedra stays in your system would depend upon how often you take it, for how long and your body's composition.
about 1 min not long
It takes about 2 days or more depending on the zombie.
zombie
Damn ma boi, pass that sh!t lol. Herb stays in your system for 4-18 days depending on your body weight and metabolism.
It will take three times as long as it took for it to grow for it to wilt, for instance, your "basic home-grown zombie" takes 4 hours to grow. in 3 times 4 hours (12 hours) after the zombie has fully grown, it will die, thus giving you up to 11 hours 59 minutes and 59 seconds to harvest the zombie after it has grown. Just in case you are wondering, it will basically take 16 hours after you have planted the basic zombie for it to wilt.
if 1 started, it might not ever end
28 Days
How long does it take pep spice to get out of your system?
every herb takes 70 mins to grow
About 30 seconds provided it was bitten by one.
St John's wort can take time to show results. Give it four to six weeks before deciding if it is or is not working for you. Keep in mind that the quality of the product and the dose are important. I've had clients tell me that they had taken an herb and had no results, then take a better quality product (but same herb) and get the results they needed and wanted. There are a lot of junk herbal products out there.