30 percent+ have significant side effects on the second dose. This is more significant in people in their early 20's. My wife and I are in our 40s. I had a r

30 percent+ have significant side effects on the second dose. This is more significant in people in their early 20's. My wife and I are in our 40s. I had a really sore arm (like, the whole arm, not the injection site) and we were both tired for a day afterwards.