I took antibiotics for 10 days about a month ago. I had to do it because of a very serious infection. I can not tell you how tired, totally wiped out I have felt since then. A few days ago I started to take Probiotics and chlorella. With in two days I am starting to get my energy back. I’m not 100% but maybe 70% better. I want to encourage you to take care of the health of your largest immune system organ, your intestines. Maybe you are not just old and worn out, maybe you are just not getting your good bacteria?