Intranasal drug delivery via hormones has been around for years. The efficacious of systemic drug delivery is near a 100% with most people. Very short duration, needs to be dosed several times throughout the day to reap any benefits.
Years ago Patrick Arnold made an intranasal androstenedione/diol. Not sure what he used as a carrier, although I remember very well it left a very "gummy" residue, making it very difficult to clean out of your nose without pulling all your nose hairs out! I used it a few times pre-work. Didn't particularly care for it, ended up throwing several bottles away.
They did have some products out, it didnt do well..
There's been a ton of devilry methods that are actually very old but are now taking way to larger use in treatments.. From needless jet injections, from patches,gels,creams, and even pellets under the skin, all these applications are older than people think.. The nasal application isn't practical and is actually be discontinued in TRT treatments, it causes way to much irritation.. It still needs to be used daily and like any other application it will still take time to see effects as levels need to build.. There's no intimidate effect right away, steroids don't work like that..
I do know that they plan on keeping it around for anxiety meds and pain medication treatments because of the fast responses with these medications, but hormonal it has no benefits... Now if we're talking steroidal for sinus treatment and allergies, they will still use them, but even at that applications with the disadvantages far out-way the advantages and positive effects.. Irritation is a major issue
Tren Base if the way to go people for fast action, but even that, it's a placebo at first and takes time to build up..