Dihexa
guinea pig
The Dose Guy’s verdictAug 28, 20267 sources
Skip it. There’s no human data on dihexa, none, and the two rodent papers the whole reputation was built on are compromised: the mechanism paper got retracted, the paper that introduced it carries a notice of concern. No trials, no safety profile, no human pharmacology. I’ll walk you through what actually exists, but understand that running this is signing up as the experiment.
What it is
A small angiotensin-IV-derived molecule out of Washington State University, built to drive synaptogenesis, the growth of fresh connections between neurons. You’ve seen the headline: roughly ten million times more potent than BDNF. That line is vendor copy, not a finding, and in a second I’ll show you it traces to no actual study. What real work exists was done in dishes and rodents. On the nootropic shelf it sits near semax and noopept, except those have human dosing behind them and dihexa has none.
What the research shows
Here’s the entire human evidence base: nothing. And the rodent base underneath it is cracked.
Realistic protocols
I’m not building a protocol out of rat math and a retracted paper. For the record, forum lore runs 1 to 10 mg swallowed or rubbed on transdermally, a couple times a week, and some stacks push to 30 mg. That’s lore, not evidence: the intermittent dosing is a guess about accumulation, because nobody has measured how long it lingers in a person. If you run it anyway, go low, go short, log everything, and don’t kid yourself that a growth-factor signal with zero human safety data is a free lunch.
Side effects
Nobody has measured a single side effect in a human, so this is anecdote only:
