Posted on

weed seeds infertility

Past research on this topic further complicates the story. A 2015 study [3] on 1,215 Danish military recruits found that men with a history of weekly pot use had 28% lowered sperm concentration and 29% lower sperm count, though the weed smokers had higher testosterone.

As one meta-analysis [8] acknowledges, the research is contradictory, but the preponderance of evidence suggests that cannabis could hurt sperm count. There could be a few reasons for these messy results: some might site researchers biased against cannabis, while others might point to confounds in studies on human populations. It’s equally possible that cannabis use affects fertility differently at different use profiles: cannabis is known to have a “biphasic effects distribution”, where low levels of use often have opposite results to high levels. It’s entirely possible that consuming small amounts of cannabis increases sperm count, while consuming large amounts decreases it.

Could cannabis increase sperm count and make men more fertile? A recent study showed that men who smoked cannabis had higher sperm counts than men who didn’t. This contradicts previous research showing that weed was harmful to male fertility. Should men who want to have kids hit the bong or stick to the straight and narrow?


This study seems to suggest that weed can increase male fertility. This may well be true; cannabis has been associated with a slew of positive effects, and it’s entirely possible that there’s some mechanism in cannabis consumption that increases sperm count. Furthermore, research [2] has shown that endocannabinoids play a large role spermatogenesis, suggesting that phytocannabinoids may have a large impact on this biological function.

These results fly in the face of a slew of previous research linking cannabis use to reduced male fertility. As lead study author Feiby Nassan stated, “Our findings were contrary to what we hypothesized at the start of the study”.

It’s also possible that the subjects of this study were non-representative of the general population, given they were men seeking treatment for infertility. The men might also have been dishonest about their cannabis use, given that cannabis was illegal at the time and location of the experiment. Further, the study didn’t control for the magnitude of lifetime cannabis use; it only looked at whether the subjects had previously smoked weed or not.

A 2013 study [4] on rats found that the administration of cannabis significantly decreased sperm count, sperm motility, and the diameter of seminiferous tubules (the cell system where sperm is gestated, matured, and transported in the testes). A 2007 study [5] seeking a safe method of contraception found that cannabis sativa reduced sperm count in male Wistar rats. A third study [6] , from 2011, found that bhang, an edible cannabis preparation common in India, reduced fertility in male rats, possibly due to alterations in the testicular endocannabinoid system.-

To understand how cannabis may affect fertility, we must understand the effect it has specifically on males and on females. We’ll start by looking at the effects on the male reproductive system, and then focus on the more complicated effects on female fertility.

As is so often the case with cannabinoid science, dosage is everything—and it may prove to be the case that very small doses of THC could benefit males who have reproductive issues that can be tied to low levels of anandamide.

Cannabis use and male fertility

Another study in 1992 (Vescovi et al.) found that levels of luteinizing hormone(LH), an important pituitary gland hormone involved in reproductive function, were reduced in male chronic cannabis users compared to a non-cannabis-using, age-matched control group. A previous 1986 study (Cone et al.) also found a significant reduction in LH levels immediately after smoking cannabis.

Female reproductive health is vastly complex in itself, as it not only comprises the ability to become pregnant but also the ability to carry healthy offspring to term and successfully give birth.

For healthy adult males, it seems that use of THC does indeed cause some negative effects on fertility, which tend to increase with higher doses. However, THC’s endogenous analogue anandamide appears to be critical to the functioning of the male reproductive system.