What about side effects? That's the best part! As you already know by now, research studies show no negative side effects, no hormonal interactions, and a very low toxicity level for ecdysterone. When tested by ICN Biochemicals on December 31, 1998, a complete safety test was performed to determine the toxicity. The data showed the amount of ecdysterone one would have to take in order to reach toxicity. The amount? 6400 mg/kg! In other words, an average 170lb person would have to take 494,528 mg of the compound to reach this point! This is 4,121 times as much as the recommended dose.