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.
Packaged shredded coconut is shelved with baking ingredients. Unopened, it should last for a year in the pantry. Opened, it will last 6 months in the pantry, 8 months in the fridge, and 1 year in the freezer. (Source: Virginia Cooperative Extension âFood Storage Guidelines for Consumersâ). Coconut oil: Refined coconut oil will last about 18 months without turning rancid. Purified, unrefined coconut oil will last indefinitely.