Pre-ejaculate (precum) is produced by two pea-sized glands located beneath the prostate, called the bulbourethral glands. The amount varies widely from person to person, and some men produce almost none while others produce a noticeable amount. While there’s no magic switch to dramatically increase production, several factors influence how much fluid these glands release, and adjusting them can make a difference.
What Pre-Ejaculate Actually Is
Pre-ejaculate is a clear, slippery fluid secreted during sexual arousal. It serves two main purposes: lubricating the urethra and neutralizing any residual acidity left from urine. This creates a more hospitable path for sperm during ejaculation. The fluid is produced continuously during arousal, meaning the longer and more intense the arousal, the more opportunity the glands have to secrete it.
The bulbourethral glands are small, and their output capacity is partly determined by genetics. Some men’s glands are simply larger or more active than others. That said, how much fluid actually appears during any given session depends on arousal level, hydration, and how long stimulation lasts.
Longer Arousal Means More Fluid
The single most effective way to increase precum is to extend the period of arousal before orgasm. The bulbourethral glands secrete fluid in response to sexual excitement, so the longer you stay aroused, the more they produce. Rushing through stimulation gives the glands less time to work.
Research published in Physiology & Behavior found that longer periods of sexual arousal before ejaculation improved multiple measures of reproductive fluid quality, with the most significant benefits occurring within the first 30 minutes. While this study focused on semen rather than pre-ejaculate specifically, the underlying principle applies: extended arousal keeps the glands actively secreting. Edging, the practice of building toward orgasm and then backing off repeatedly, is the most direct application of this. Each cycle of rising and falling arousal gives the bulbourethral glands additional time to release fluid.
Slower, more deliberate foreplay or solo stimulation that focuses on building tension gradually will generally produce more precum than a quick session. Mental arousal matters too. Fantasy, anticipation, and psychological excitement all trigger the same glandular response as physical touch.
Hydration Has a Direct Effect
Pre-ejaculate is mostly water, so your hydration level directly affects how much your body can produce. When you’re dehydrated, your body prioritizes water for critical organs like the brain and heart, pulling resources away from less essential functions, including glandular secretions.
Dehydration makes all reproductive fluids thicker and lower in volume. Proper water intake keeps these secretions at a thinner, more fluid consistency, which also makes precum more noticeable. There’s no specific volume of water that’s been studied for this purpose, but consistent daily hydration (enough that your urine stays pale yellow) ensures your body has the raw materials to produce glandular fluids freely.
Drinking extra water in the hour or two before sexual activity can help, especially if you tend to be mildly dehydrated from coffee, alcohol, or not drinking enough during the day. Alcohol in particular is a double hit: it dehydrates you and can blunt arousal intensity, both of which reduce precum.
Supplements and Nutrition
You’ll find plenty of online advice recommending supplements like lecithin, zinc, or herbal extracts to increase sexual fluids. The evidence here is thin and mostly focused on semen rather than pre-ejaculate specifically.
Lecithin, a fatty acid mixture found in eggs and soybeans, is one of the most commonly recommended supplements in online forums. There is no scientific research supporting the claim that lecithin increases semen volume or pre-ejaculate production. The popularity of this recommendation appears to be entirely anecdotal.
Zinc plays a documented role in testosterone balance and sperm quality, and a deficiency can reduce overall reproductive fluid production. If your diet is low in zinc (common if you eat little red meat, shellfish, or legumes), correcting that deficiency may help. But supplementing beyond normal levels hasn’t been shown to boost precum specifically. Other supplements sometimes mentioned, like ashwagandha, maca root, and fenugreek, have limited evidence linking them to modest improvements in semen volume or sperm count, but none have been studied for their effect on pre-ejaculate.
A balanced diet that supports overall sexual health is more useful than any single supplement. Foods rich in water content (fruits, vegetables) contribute to hydration, while adequate protein and healthy fats support hormone production.
Arousal Quality Matters, Not Just Duration
Not all arousal is equal when it comes to triggering the bulbourethral glands. The intensity of excitement plays a role alongside duration. Novelty, anticipation, and strong psychological engagement all tend to increase the physical arousal response, including glandular secretion.
If you’ve noticed that precum production varies between different partners, situations, or types of stimulation, that’s normal. The glands respond to the overall level of sexual excitement, which is a combination of physical sensation and mental engagement. Watching or reading something arousing before physical contact, building anticipation throughout the day, or incorporating new elements into sexual activity can all heighten the arousal response and, with it, fluid production.
What You Can’t Change
Genetics set the baseline. The size and activity level of your bulbourethral glands are largely inherited, and no supplement or technique will transform someone who naturally produces very little precum into someone who produces a lot. Age also plays a role. Glandular secretions, including pre-ejaculate, tend to decrease gradually as men get older, in line with broader changes in sexual function.
Certain medications can affect fluid production as well. Antihistamines, which dry out mucous membranes throughout the body, can reduce all glandular secretions. Some antidepressants and blood pressure medications also affect sexual fluid production as a side effect. If you’ve noticed a sudden decrease, it’s worth considering whether a medication change coincided with it.
The practical takeaway is straightforward: stay well hydrated, take your time with arousal, and focus on the quality of the experience. These three factors represent the levers you actually have control over, and for most people, they make a noticeable difference.