Yes, our NADH products RAPID, CONSTANT, ARTHROS and VIS*ON can be used after the expiration date. You will find the expiration date of our products printed on every box/flacon. We had our products tested by a quality assurance lab and received confirmation that our NADH RAPID ENERGY meets the specs of 20 mg NADH per tablet even 3 years after the expiration date (obligatory are 2 years).
The same holds for our other NADH products ARTHROS CONSTANT and VISION. For our new product NADH KILOW produced in March 2019 we have no stability data yet. Longterm the content of NADH in the tablets declines because NADH is oxidized to NAD+ and further on to Nicotinamide (Niacin).