The most common thing you might notice is mild redness, tenderness, or slight swelling where the needle went in, and that usually settles quickly
Give it another five minutes
However, test-tube and animal studies show that guarana extract may boost metabolism and limit fat cell production by suppressing certain genes ( Side effects: Because guarana is high in caffeine, it may cause insomnia, headaches, nervousness and increased heart rate and anxiety, especially when taken in high doses ( Summary Guarana which is especially high in caffeine may boost metabolism, but more research is needed to determine whether it suppresses appetite or promotes weight loss
M., & Vigara, J
(PubMed) Shay KP, Moreau RF, Smith EJ, Smith AR, Hagen TM
Its treatment was reported to increase the levels of GSH and the activities of GPX and GST, along with a decrease in cardiac lipid peroxide production in a rat model of myocardial injury caused by diazinon (a pesticide) [180]