Initial findings of a Massey University study has uncovered how prevalent methamphetamine supply is compared to cannabis.

The study was carried out through Facebook, asking more than 6000 participants about the availability of drugs they'd used in the last six months.

It found methamphetamine is more available in all regions.

READ MORE:  Meth far too easy to find in small-town New Zealand, says expert

Of those questioned 54 per cent said the current availability of methamphetamine was very good, compared to only 14 per cent saying the same about cannabis.

Associate professor, Chris Wilkins says the findings suggest a need to further prioritise a focus on meth rather than cannabis.

"You know if methamphetamine is really so available and much more available than cannabis there is a case there to review that kind of balance."

He says the data is backing up anecdotal claims meth is easier to obtain.

"Online data can provide really quick updates about how the situation is going. So we are really keen to engage with government agencies and they're keen to see what we've got and how it can be used."

Detailed analysis of the survey will be presented to the Ministry of Health later this month.