I'm no scientist but I can only imagine that different companies synthesize codeine in different fashions, thus making the effects seem stronger from one to the other. The pink 10s seem to work the best for me, followed by the whites and then the blues. The yellow norcos are great because they have less tylenol in them.
Which companies make white 750 hydrocodone. The white lon,g flat ones do not work but the short thicker white ones work
I'm not sure, but my best guess is that companies use what are called fillers to make the pills. These fillers differ from company to company, and although they are harmless they do tend make how you feel a little different. For example they can make one 10/500 (blue) feel weaker, or upset your stomach more than another 10/500 (white). I have found the pink 10s to be the strongest for me. Hope this helps!!