so this further proofs my point then, it is a dose dependent inhibition unlike oral intake. in the polichem trials they had 24% reduction in dht after 7 days with the 0.2mg /ml dose. based on mozarellas study, we know that dosage as low as 0.005% which translates to 0.05mg /ml does not result in systemic impact but can give benefits for hair count after many months. so it is quite reasonable to assume that an effective dose exists where the half life outcompetes the accumulation of drug and a consistent inhibition is met. that seems to be the case with the 0.005% but could be even higher. if we use the 0.2mg 0.02% solution, at the end of the 7th day we have 24% reduction. if we apply half of that it should be substantially lower just by the fact that half life of finasteride is 15 hours. lets say to prevent accumulation you in additoon to using an even further reduced dosage(which still inhibits scalp dht around 80% of what oral finasteride does) and take a day off for example once or twice a week which is not enough for scalp dht to rebound but for systemic impact to clear out due tk the short half life
then this is a regimen that could be somewhat effective at at least maintaining hair and have very low systemic impact. you can even use 2-3ml bc with mozarella protocol you only use 1/5th of that dosage.
why would this not work? there is people i have talked to that tried various topical finasteride dosages and found that 0.004% per day, slightly less than mozarellas study had ZERO systemic dht reduction. it is not unreasonable, i think its probably more effective than stuff like low dose CB as well tbh