Shelf life on DIY ingredients

One of the drawbacks of DIY is that some of the ingredients are used in very small quantities but are only purchasable in fairly large quantities. I started making DIY Schmilk about a year ago, and I still make it periodically using the originally purchased ingredients. At what point should I be thinking about throwing those ingredients out?

I feel like I’m not telling you anything you don’t know, but it depends on the ingredient.

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