I'm not disputing that there is some evidence, just not enough or the kind that proves without a doubt that 12.5 and 15% concentrations of minoxidil are even as effective let alone more effective than 5%.
A person who is trying to sell it to you is the last person you look to for an opinion...Of course he's going try to support his claims. You need to look for unbiased evidence from a neutral source.
If you have a study that PROVES minoxidil concentrations higher than 5% are equally or more effective than 5% on the human scalp please share it with us
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Unfortunately with such little physical evidence to support higher concentrations of minoxidil being more effective we have to partly rely on opinions of users...
There's not enough evidence for me to beleive that higher concentrations of minoxidil is more effective.....However If for whatever reason I have no other weapon in my arsenal for combatting hairloss I would consider using it.....If the proven stuff doesn't work then it's time to experiment with the other stuff like Revivogen, Xandrox, spironolactone.
I guess that was kind of my adive to the original poster. Use the stuff that has been tested and proven to work on the human scalp in concetrations recommended by the FDA first (ex 1mg finasteride and 5% minoxidil 2x/day). If that doesn't work take the lesser proven route. Applying 2x/day can be a pain in the arse but you have to make some sacrifices to fight hairloss.
kisstopherp...I know this is a tough decision and it's one you have to read up on and decide if it's for you.
Good luck on whatever route you take. Just be sure to check in and let us know how its going.
Hairloss can be fought....click on "my Regimen" then click the web address to see the results I've had on "The big 3". Keep in mind I started when my hairloss had gotten pretty bad. 10 years worth of loss is a hard thing to come back from.
BHD