Daily dose of cannabis extract could reverse brain's decline in old age, study suggests

Regular low doses of THC dramatically boosted memory and learning in older mice, say scientists, who plan a clinical trial in humans later this year

Researchers have come up with an unusual proposal to slow, or even reverse, the cognitive decline that comes with old age: small, daily doses of cannabis extract.

The idea emerged from tests on mice which found that regular, low doses of tetrahydrocannabinol (THC) - the main psychoactive ingredient in cannabis - impaired memory and learning in young animals, but boosted the performance of old ones.