It's definitely a rabbit hole of research, and you'll find a ton of them sound very promising. I've settled on the ones that have the most research, preferably human, and have been around the longest.
For oils I use this for labels:
For peptides, this one:
They're super easy to use via apps where you can design labels.
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I'm planning to re-vial some of my Primal stash into long term storage friendly vials with coated stoppers, and since the labels that come on Primals gear don't seem to like being relocated, I have some replacement labels designed for them.
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Kinda cheezy, but it's actually fun making labels.