Going back to the original question ...
Originally Posted by anticuchos
These powder packages do not carry a fact sheet. Do garlic powder have significant nutrients? How does the garlic powder fare with the real thing in terms of nutrients? How long can I keep the garlic powder in a container on the shelf? It is not listed on the package. I have searched and the results vary greatly. From half a year, one year, two years. Which is the accurate one?
Dried herbs and spices will generally not have nutritional
information on the labels since they are used in such small amounts for "flavoring"- not in a significant enough amount that they would alter the "nutritional" value of a dish.
Salts- like garlic salt, onion salt, etc. and herbs blended with salt (like lemon pepper) may show the sodium content - but not always.
How long herbs/spices will last depends on what they are, how they are packaged, stored, and the environment.
A bottle/jar of garlic powder might "last" for 10-years ... although the pungency and flavor will begin to deminish after 6-months ...