I think you misunderstood what I was saying. I wasn't negating your comment. Yes, of course argon or nitrogen atmospheres are used to control oxidation and prevent unwanted side reactions. It's called creating an inert atmosphere. I just mean it's beyond the scope of the common person's capabilities and resources without special equipment and training.
Yeah like < 1%.
To produce 7-OH outside the body in usable quantities, I agree – you need a targeted chemical oxidation; e.g.: using an oxidant like oxone (potassium peroxymonosulfate) or mCPBA (meta-chloroperoxybenzoic acid), which indeed will produce a higher yield than natural metabolism. IIRC it's something like 40% - 50% yields in the literature.
However, most ppl don't have lab access and, moreover, they don't love the idea of consuming "unintentional reaction" byproducts. And it isn't something one can safely accomplish via kitchen chemistry and without the proper equipment.
That being said I
do see your point for the individual with proper lab access. Also, yeah I can see the potential appeal of this to a clandestine chemist, but that's for another discussion on another site probably…
P.s., your profile pic = awesome and hilarious!