5 manufacturers giving you a "No" is way too small a number for you to give up on this idea.
Keep pushing away.
Only once you have 200+ manufacturers tell you they can't make your supplement, then you can consider your other options.
This is unrelated to manufacturing, but I recently had to message over 2000 people PERSONALLY (not just a copy-paste thing) to get 50 responses back, half of which were "No."
To an even more extreme degree, 458's team cold called over 115,000 numbers to get 114 sales.
(see: Cold Calling Realities)
I hope my point has been made clear
Keep pushing away.
Only once you have 200+ manufacturers tell you they can't make your supplement, then you can consider your other options.
This is unrelated to manufacturing, but I recently had to message over 2000 people PERSONALLY (not just a copy-paste thing) to get 50 responses back, half of which were "No."
To an even more extreme degree, 458's team cold called over 115,000 numbers to get 114 sales.
(see: Cold Calling Realities)
I hope my point has been made clear