The FDA and DOJ now treat it as an illegal drug and for good reason, given the unknown safety profile
These may include mild headache, dizziness, fatigue, or slight nasal irritation
A recently published study found that rinsing with green tea reduced plaque-forming bacteria in the mouth just as well as a prescription mouthwash

animal studies suggest it may support healing of gastric ulcers and damaged intestinal lining Preclinical models suggest it may help modulate inflammation, though this has not been established in controlled human trials Known risks and side effects: Because it is sold as an unregulated research chemical rather than a manufactured pharmaceutical, product purity and dosing accuracy cannot be verified, and the FDA has flagged potential impurities and manufacturing-quality concerns FDA's Category 2 determination specifically cited potential immune reactions and hypersensitivity as a safety concern User-reported (non-clinical-trial) effects include injection-site irritation, redness, or swelling, along with occasional headache, nausea, or lightheadedness, based on anecdotal reporting rather than controlled studies No long-term human safety data exists