If you're bored and feel like reading, a very interesting thread about N-ISO on Quora. Very informative. Basically, what I've always said to peeps on here about side effects --- headaches, itchy red eyes, nausea, vomiting, confusion, skin issues, fatigue, very brief buzz with a hard crash down. You can eat and sleep on it. Redosing is ineffective.

Crystals are wet/oily, very brittle, dark spiderwebs for the crackback, too clear, and have smooth sides. Very rank chemical taste. Toxic. Irritant. Made in China and imported to Mexico then up here to us naive Americans. It's the perfect meth imposter and fools many, fools even plugs. Increasingly, it's being used by middlemen/runner to pull a switch-er-roo on you. Your trusted plug may not even know what they're doing, so tell your trusted plug of a dishonest runner. Reports going around that N-ISO is being sold as real meth, but all fake.

Sometimes, it's just a cut. Depends on the ratio of it over the actual meth. A light cut doesn't mean it's all bad, the heavier the cut the more garbage it is. I've heard N-ISO doesn't respond to an acetone wash, but it responds to liquid ether.