mannitol is a non caloric sweetener, wouldn't be very great if smelled strong like solvents. ie the smell is a volatile in order to smell it easily likely a solvent used in manufacturing some folks just say its the bac water however the smell is different IMO although def adds to the smell, otherwise every peptide and even test cyp would have a similar smell because of BA content. I dont know but interesting that someone notes same smell from insulin, so likely some manufacturing left over.
its been discussed before that mannitol will reduce water retentions but isn't enough to do much of anything in amounts in a vile even if took whole thing in 1 go.
has been noted in the past that potentially (never seen evidence) that generics/fakes just were antidiuretic to give side effects like hgh.
I dont think big pharma says not to use hgh in children because of mannitol, as thats who its actually used for, kids. of course some others with wasting AIDS etc but now days with AIDS more or less being cured its kids who get HGH RX. all that to say I doubt majority of pharma HGH says not to use in kids.
I suspect there is different isoforms/analog(may be incorrect term) of somatropin and varying levels of the isoforms offer slightly different effects, OR simply pharma is used more sparingly. one thing for sure is I dont know and I dont think anyone knows with certainty. but like HCG has 6 or so isoforms of varying levels, the alpha being IIRC what acts as a memetic for LH etc in males. this is one reason why pharma uses IU, as its not a dosage per say but rather the effectiveness of the drug which may include multiple forms. even vitamin C or other vitamins are not exact same and can have different orientations at molecular level. not sure why I cant remember the term but its a thing. more specifically vitamin D is not just a singular thing "vitamin D" and why it is expressed as IU and not mg as it needs to have useful forms in the group in order to get a specific effect.
anyway, dragging things off topic but its important folks understand that a drug etc esp when is expressed as IU is usually a group of varying things and is not like getting a mg of pure gold. or like how synthetic B12 is a totally different name/chemical than naturally occurring b12 blue cyanocobalim
vs natural methylccobalim red stuff and I I think there is even further forms that occur naturally, but all called B12.