^^You have to read the labels, especially the warnings! It’s no joke. A medicine that says “take with plenty of water,” that’s because the med can crystallize in your tissues.
A med that say “don’t take with dairy,” that’s because the med doesn’t get absorbed well with fair.
“Take on an empty stomach.” Again, so it is absorbed well.
“Don’t take with grapefruit juice” because you can die if you do.
“Stay out of direct sunlight” because the med makes you photosensitive.
If you take a vitamin with food that is better taken in an empty stomach, 95% of the time it doesn’t matter, because most people aren’t so deficient they will be extremely sick if they only partially absorb the vitamin. But, if it’s thyroid meds, or antibiotics, or blood pressure medicine it really matters.
You have to read whether to take with or without food, the correct dosage, any medicines that might interact badly.
You can’t take iron within 4 hours of taking hypothyroid meds. There is crazy stuff like that too.