Many people who have gone on the leptitox Diet say that it actually feels similar to withdrawing from an addictive substance. This can last anywhere between 3 days to an entire week, it only lasted a few days in my case. People who have had the keto Flu report feeling drowsy, achy, nauseous, dizzy and have terrible migraines among other things. The first week is usually when people attempting a Keto Diet fail and quit, just remember that this happens to everyone early in the process and if you can get past the first week the hardest instant keto part is over.
https://www.marketwatch.com/press-release/leptitox-reviews-updated-is-it-scam-nutrition-or-legit-review-2020-03-05
https://www.marketwatch.com/press-release/instant-keto-review-read-weight-loss-pills-ingredients-2020-03-07