I’m not finding 44 266, a lot of LNK International’s pills are new and not in the databases yet, but it is OTC. You can try calling LNK at 631-435-3500 or (631) That’s what I was thinking also, since my own caffeine tabs have the 44 on them. And Vivarin are yellow, & believe the Stay Awake were too. But anytime you have a question of what a pill may be, you can call the Poison Control Center, and they should be able to ID any RX or over the counter med for you. By Code numbers/letters. Or probably even a partial code plus description of the pill shape & color, etc.
The biggest problem would probably be something Generic that had the numbers scratched off, since so many can be just white tab or caplet, etc. But if something appears it Never had any code or manufacturer name or anything on it … I think it is probably something considered more of a nutritional than a medication. Examples: Chromium Picolinate, Vitamin E, Lecithin, etc. The trouble there is like the blue tab with no numbers on it I once found … was an anti-algea tab for the aquarium