Hi Daniel,
There are a few issues with this (but I love the idea), one of which is a good source and another... the smell. I think we will need to mask the smell to have this be acceptable for most folks. I will be traveling next week to see if I can find some raw materials.. and will ask about spermidine as well. If we do find a source, the next step will be to do something with it to limit or mask the smell.
A
If you cap it up is it that bad? I'm sure the raw powder has a pretty definite odor but putting things in gel caps tends to attenuate that to a decent degree.
Maybe you could put a active charcoal sachet in the bottle to soak up some of the smell (I'm only half joking about btw - might work).
I take some Ceylon cinnamon capsules and they smell pretty good, maybe mix that in.
The studies on this compound look too promising for it to be unavailable. There are plenty of supplements out there that don't have half the science this does to back it up.