Don't you think that's risky using something other than pharmacy grade. I finally found a prescription one on Amazon. I asked their chatbot Rufus but Rufus steered me wrong. Finally got the right link from chatbot and found the RX one Amazon sells.

I was on autofill with Amazon for the Resp-Ease 7% but now it is not available. Ended up using my prescription at CVS for 60 vials of another brand of 7% for $38. I think you can get a better deal but Amazon doesn’t seem to have a good deal at this time.