If you don't feel the positive effects while taking the NADH supplements -- don't worry. Because you bought the ENADA / CoE1 / NADH from us, at The NADH Store, we will refund your money in full (less shipping costs) within 30 days from the date of purchase -- no questions asked. There is no risk in trying the NADH you bought from us.
Once the NADH nutritional supplement is in your cells, the positive benefits are wonderful. The positive physical and mental effects will vary depending upon how and why NADH is being taken, and how much NADH is needed. Most feel a difference within the first few days. My in-laws felt their positive effects after 18 days (taking 5mg a day.) Individual results will vary. Your body is made up of 60 trillion cells and each cell has many mitochondrion engines needing NADH. Where mother nature decides to use its new NADH is up to nature and your body.