Guidelines and Precautions. The jury is still out on melatoninâs effects on blood pressure. If you have high or low blood pressure, or take medications to control your blood pressure, it is best to avoid the supplement unless advised otherwise by your doctor.uidelines and Precautions. The jury is still out on melatoninâs effects on blood pressure. If you have high or low blood pressure, or take medications to control your blood pressure, it is best to avoid the supplement unless advised otherwise by your doctor.
1 This can cause the can to bulge or rust.  Use canned tuna by the expiration date on the can. If the can doesn't have a best by date, mark it with the date of purchase and use the tuna within 12 to 24 months of purchase.
How long does unopened turkey gravy last? The precise answer depends to a large extent on storage conditions - to maximize the shelf life of turkey gravy, store in a cool, dry area. How long does an unopened can or jar of turkey gravy last at room temperature? Properly stored, an unopened can or jar of turkey gravy will generally stay at best quality for at least 2 years. Is unopened turkey gravy safe to use after the ? expiration date on the package?