N after expiration

[Sunny-Pia]

How long after expiration, if stored properly, will the N be good for use?

 

[Hercules]

People have had samples from old bottles tested at a lab. The N was still good after 20 years.If unopened and stored properly, the N only loses about 1/2 percent of potency per year.

 

[Sunny-Pia]

People have had samples from old bottles tested at a lab. The N was still good after 20 years.If unopened and stored properly, the N only loses 1/2 percent of potency per year.

Thanks for confirming!