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.
Fully prepared canned foods are a great option if you canât cook. However, even if you cook your own meals canned fruits and vegetables can save you a lot of time and energy. If you ask how long does canned food last, the usual shelf life of canned food ranges from 6 months to 2 years, from the date of manufacturing. Hence you can do your canned food shopping in bulk and save time and energy.