Okay, For Dihexa + DMSO: it turns out that the rubber plunger in the small, 1 ml polyethylene syringes is not affected by DMSO (to my amazement), so we do not need to use a glass syringe. The eBay/Hong Kong glass syringes were not very good anyway. Also, there are inexpensive polyethylene (PE) syringes with polypropylene (PP) plungers, and I suspect that these will work fine with things like MCT oil that do kill the rubber plungers.
I got some 99.9% pharmaceutical grade DMSO from kaitlynstreasurebox on eBay. They claim that they've been selling DMSO for 30 years, and that they do not sell the cheap stuff. I made a small batch of 90% by measuring 9 ml of DMSO, and adding 1 ml of distilled water. That may seem like a "well, duh," but the result is less than 10 ml, so you cannot simply add water until the total is 10 ml. Well, you can, but the result will be something less than 90%, although that probably won't hurt anything in practice.
50 mg of Nyles' Dihexa just barely dissolves in 2 ml of 90% DMSO. The result looks like syrup. I have a few 3 ml dropper bottles that I got from Extreme Vaping (they have several other sizes), so I added another 1 ml of 90% DMSO and put the result into the 3 ml dropper bottle. That extra 1 ml really helps, changing it from a syrup to a normal, flowing liquid. I got about 103 or 104 drops out of it, so 2.9 ml of DMSO + 50 mg of Dihexa should result in almost exactly 100 drops, i.e., 0.5 mg per drop; nice and simple.
I've been washing my hands to get off any lotion, and then placing 4 drops, 2 mg, into the palm of one hand, and spreading it around with a finger. The DMSO takes some time to absorb through the skin in most places, but seems to go through the skin of the palms quite quickly, just a minute or so. I'm not certain of this -- maybe I accidently used more drops, or spread it over a smaller area -- but I think it absorbs much more quickly through the palms.
Because it is absorbed so quickly, even I can feel the effects, and from just 2 mg. In contrast, I did not notice anything orally, even with 50 mg mixed in (but not really dissolved in) MCT oil. However, this does not by itself mean that this is a much more effective way of taking Dihexa, because delivering a drug fast makes it much more noticeable (one reason drug addicts often end up using needles). However, my impression is that this is indeed a much more efficient way of absorbing Dihexa, and I tend to be happy taking just 2 mg or sometimes 4 mg per day. Having said that, I have no clue as to whether that's just nonsense on my part, whether I really need to take 10 mg or even 20 mg per day. Hopefully we have people here who (1) can tell much more accurately than I can how much Dihexa they have absorbed into their system, and (2) will be able to mix it with DMSO and try it out. Again, the reason I used 90% DMSO is because it moves through the skin quite a bit faster than 100% DMSO (kaitlynstreasurebox also has some 90% DMSO for those who don't want the hassle of mixing it).
Nyles is still selling Dihexa, just not on eBay. Google nyles7 and you'll have his website. Truelife Research also sells it, and claims 99% purity vs Nyles' 97%, but of course they also charge more.
Overall, I think this makes Dihexa much more economically feasible, but there is still the question of whether DMSO somehow messes up Dihexa, and whether taking it orally, perhaps after (mostly) dissolving it in MCT and perhaps adding pepper, is actually better. And of course, Angus' experience with simply getting some on his finger and then brushing it under his tongue may actually be best. I would only point out that he may be using more than he realizes, so we need to know how many "finger touches" equals 50 mg. Hopefully, he can also try the DMSO route and determine whether one is more effective than the other. If DMSO does reduce the effectiveness of Dihexa, then the finger/tongue method may well turn out to be the best way to take it!
And finally, J147 is also soluble in DMSO, and at the crazy prices that stuff costs, I really hope that using a "DMSO palm injection" will work, especially since they say that it is not easily absorbed orally.
Phil