Homeopathic medicines are good indefinitely because they are very stable when stored under normal conditions (away from moisture and excessive heat or cold). For this reason, in the US the FDA has exempted homeopathic manufacturers from putting expiration dates on the label.
In the U.S. it has become a common practice to put Lot numbers and Expiration dates or “Best if used by” or manufactured date on foods and supplements … and homeopathic medicines. These are part of “Good Manufacturing Practices” or GMP’s. The lot numbers are important because they show that there are controls in place during the production process. The Expiration dates are also important because it causes the stores and the manufacturers to rotate their stock and keep the freshest product available to the consumer.
However with the exceptions of infant formula and dairy products in some States, the use of EXP on other foods and homeopathic medicines is voluntary. Sometimes a good dose of common sense and your nose can help you make the correct decision.
We are among the many creatures that also depend upon their sense of smell to find food and determine whether the food is edible. These dolphins playing near a Belize reef allow you just a moment to catch their picture before they are gone. Besides getting close and not scaring them, having the correct lighting and and focus adjustment, you need to have a fast camera and a little bit of good luck. As you become more experienced and skilled, luck plays less of a role. It’s a lot easier taking pictures of moray eels, eggs and noses.