Can CBD Protect Memory? Brazilian Study Provides Clues

CBD - Memory holds much more than just recollections. It supports learning, experiences, and part of each individual's identity. When hormonal changes compromise this process, science seeks to understand which paths can help preserve cognitive function. 

It was precisely this relationship between hormones, brain, and the endocannabinoid system that motivated a Brazilian study to investigate the effects of cannabidiol (CBD) in an experimental model of estrogen deficiency.

Published in the Journal of Neuroendocrinology, the research was conducted by researchers from the Universidade de São Paulo (USP) and the Universidade Federal do Rio Grande do Sul (UFRGS). The work showed that CBD improved performance in memory tests and promoted changes in the hippocampal endocannabinoid system, a region of the brain directly linked to learning and memory formation.

The results, however, were obtained in animals and should not be interpreted as evidence of efficacy in humans.

CBD and memory: how the study was conducted

To investigate the effects of cannabidiol, the team used three-month-old female Wistar rats divided into four groups: one subjected to sham surgery, another consisting of untreated ovariectomized animals, and two groups of ovariectomized rats treated with estradiol or CBD.

After three weeks of recovery from surgery, the animals received subcutaneous injections of CBD at a dose of 10 mg/kg, estradiol, or an active ingredient-free vehicle for 21 days.

Subsequently, the researchers evaluated cognitive capacity through two tests widely used in preclinical research: the object recognition test and the fear-related memory test.

According to the scientific paper, CBD improved the female rats' performance in the object recognition test at a level comparable to that observed with estradiol. In addition, both CBD and hormone treatments reversed deficits observed in the fear-conditioned memory test.

The authors themselves point out that this comparison relates exclusively to the results obtained in this experimental model and does not mean that cannabidiol can replace hormone therapy in clinical practice.

Hippocampal endocannabinoid system showed changes

In addition to behavioral tests, the researchers analyzed the hippocampus, a brain structure essential for learning and memory processes.

According to the study, CBD treatment reduced the expression of the FAAH and MGLL enzymes, responsible for degrading the endocannabinoids anandamide and 2-AG. As a consequence, there was an increase in these molecules in the animals' brains.

Estradiol showed similar changes and also increased the expression of the NAPE-PLD enzyme, involved in anandamide synthesis.

According to the researchers, these changes reinforce the hypothesis that modulation of the endocannabinoid system may be related to the memory improvement observed in the experiment.

Results reinforce research on CBD and women's health

The study expands a line of investigation that seeks to understand the involvement of the endocannabinoid system in cognitive processes associated with estrogen deficiency, especially in models used to study changes similar to those observed during menopause. 

This communication network present in the body consists of receptors, molecules produced by the body itself called endocannabinoids, and enzymes responsible for the synthesis and degradation of these compounds. In the brain, the endocannabinoid system acts in modulating functions such as memory, learning, mood, and stress response, particularly in the hippocampus, a region fundamental for memory formation and retrieval. 

In this context, the researchers investigated how CBD could influence this brain signaling in an experimental model of reduced estrogen levels.

In recent years, scientific interest in the potential of medical cannabis for symptoms related to climacteric and perimenopause has also grown. However, the authors emphasize that the model used represents an abrupt drop in hormone levels caused by surgical removal of the ovaries in young animals, a scenario different from natural menopause, which occurs gradually and involves several physiological factors.

Another important aspect is the route of administration used in the research. CBD was administered by subcutaneous injection, a method distinct from commercial formulations such as oils and other derivatives used by patients.

For this reason, the results do not allow establishing dosages, methods of use, or clinical recommendations for humans.

Research opens new perspectives for clinical studies

Although the findings are considered promising within basic research, the authors themselves highlight that clinical trials in humans are still needed to confirm whether the observed effects can be replicated in patients.

Until these stages are completed, the work represents another step forward in understanding the interaction between the endocannabinoid system, hormones, and memory mechanisms, contributing to the development of future evidence-based therapeutic strategies.

The study also reinforces the role of Brazilian scientific research in investigating the therapeutic potentials of phytocannabinoids, by expanding knowledge on how cannabidiol can act on neurobiological processes related to cognitive decline associated with estrogen deficiency. 

Phytocannabinoids are natural compounds produced by the Cannabis plant, capable of interacting with different body systems, including the endocannabinoid system. 

Among the most studied are cannabidiol (CBD) and tetrahydrocannabinol (THC), molecules that feature distinct structures and mechanisms of action. While CBD has been investigated in research related to modulating brain activity, inflammation, and physiological balance, other phytocannabinoids are also being analyzed by science for their potential therapeutic applications. 

In this scenario, preclinical studies such as this one seek to understand how these substances can influence specific biological processes prior to conducting clinical trials in humans.