Most natural methods for encouraging labor work by triggering the same hormones your body already uses to start contractions, primarily oxytocin and prostaglandins. Some of these approaches have genuine clinical evidence behind them, while others are more tradition than science. Here’s what the research actually shows about each method, so you can have an informed conversation with your provider about what might be worth trying.
Nipple Stimulation
Nipple stimulation is one of the most well-supported natural methods because it has a clear biological mechanism: it causes your body to release oxytocin, the same hormone hospitals use (in synthetic form) to induce labor. You can use a breast pump or your hands, and the typical protocol involves stimulating for periods of at least 30 minutes at a time, with breaks of up to 15 minutes as needed, aiming for a cumulative total of about two hours.
In a randomized pilot study, women who performed nipple stimulation needed a median of roughly 69 minutes before they started having regular, adequate contractions (defined as at least three contractions in a 10-minute window). That said, 88% of the women in that study still eventually needed synthetic oxytocin before delivery. So nipple stimulation can get things moving, but it may not be powerful enough on its own to carry you all the way through labor. It works best when your body is already close to being ready.
Eating Dates in Late Pregnancy
Eating dates in the final weeks of pregnancy is one of the more popular recommendations, and there’s enough interest that clinical trials are actively studying it. The typical approach used in research is eating three Medjool dates per day starting at 34 weeks and continuing until delivery. Dates contain natural sugars and compounds thought to have an oxytocin-like effect on uterine muscle.
Several smaller studies over the past decade have suggested that women who eat dates regularly in late pregnancy arrive at the hospital more dilated, have shorter early labor, and are less likely to need medical induction. Larger, more rigorous trials are still underway, with results expected in the coming years. Dates are nutritionally dense and safe to eat during pregnancy, so the downside is minimal even if the labor benefits turn out to be modest.
Sexual Intercourse
The logic behind sex as a labor starter sounds solid on paper. Semen contains a high concentration of prostaglandins, hormone-like substances that soften and ripen the cervix. Orgasm releases oxytocin. And the physical contact itself may stimulate the lower part of the uterus. That’s three plausible mechanisms stacked together.
The problem is that the clinical evidence hasn’t kept up with the theory. A Cochrane review, the gold standard for evaluating medical research, found only one small study of 28 women, from which “no meaningful conclusions can be drawn.” The role of intercourse as a method of induction remains officially uncertain. It’s unlikely to cause harm in a normal pregnancy (your provider will tell you if there’s a reason to avoid it), but there’s no guarantee it will start labor either.
Castor Oil
Castor oil is one of the more aggressive natural options. Research suggests that 54% to 58% of women will begin labor within 24 hours of taking it. The recommended dose in studies is two ounces, taken once by mouth. It works by stimulating the intestines, which in turn can trigger uterine contractions.
The trade-off is significant side effects. Nausea is common across multiple studies, and diarrhea and cramping are practically guaranteed. You’ll be starting labor already dehydrated and uncomfortable, which isn’t ideal. Studies don’t recommend using castor oil before 40 weeks, and you should avoid it entirely if you’ve had a previous cesarean section. This is not a casual remedy to try on a whim. Talk to your provider first.
Evening Primrose Oil
Evening primrose oil is used primarily for cervical ripening rather than directly triggering contractions. The idea is that by softening the cervix, it prepares your body so that labor starts more easily on its own or responds better to other methods.
A randomized controlled trial of 200 first-time mothers at 41 weeks or beyond found that a single vaginal dose of 1,000 mg evening primrose oil significantly improved cervical readiness scores compared to a placebo. Women in the treatment group also had shorter labors overall. No adverse effects were reported. The key detail here is that this study looked at women who were already past their due dates and had cervixes that weren’t yet favorable for labor. If you’re in a similar situation, it may be worth discussing with your provider.
Acupressure and Acupuncture
Two pressure points come up repeatedly in labor research. SP-6 is located about four finger-widths above the inner ankle bone, and LI-4 sits in the fleshy area between the thumb and index finger. Both are traditionally associated with stimulating uterine activity in Chinese medicine.
A randomized trial of 63 first-time mothers found that acupuncture at these two points significantly reduced the total duration of labor compared to sham (fake) acupuncture. Interestingly, it didn’t reduce pain scores, just how long labor lasted. You don’t necessarily need a professional acupuncturist to apply pressure to these points. Acupressure (firm, sustained finger pressure) on SP-6 and LI-4 is something a partner can do during early labor, though the research specifically tested acupuncture with needles.
Walking and Movement
Staying upright and moving uses gravity to help the baby’s head press down on the cervix, which can stimulate the release of oxytocin and encourage dilation. Walking, swaying, bouncing on a birth ball, or climbing stairs are all commonly recommended. There’s no specific “dose” of walking that’s been proven to start labor in someone whose body isn’t ready, but movement during early labor is well established as a way to keep contractions progressing and may shorten the first stage of labor.
The honest truth is that walking probably won’t trigger labor if your body isn’t already gearing up for it. But once contractions have started, staying active rather than lying in bed gives you a mechanical advantage.
What Actually Matters for Timing
None of these methods work like a switch you can flip. They work best when your body is already showing signs of readiness: your cervix is starting to soften, you’re experiencing some irregular contractions, or you’re past your due date. Trying to force labor at 37 or 38 weeks with natural methods is unlikely to accomplish anything and may not be safe.
The biggest factor in when labor starts is your baby’s own developmental signaling. Late in pregnancy, the baby’s lungs produce a protein that triggers a hormonal cascade leading to labor. Natural methods can nudge a body that’s already on the verge, but they can’t override biology that isn’t ready yet. If you’re at or past 40 weeks with a normal pregnancy, combining a few of these approaches (dates in the weeks leading up, nipple stimulation, staying active, evening primrose oil if your cervix is unfavorable) gives you the best chance of encouraging things along without medical intervention.
If you’ve had a previous cesarean section, be cautious. Some natural methods that stimulate contractions, including castor oil and certain prostaglandin-based approaches, carry a small risk of uterine rupture along the scar line. This is the same reason hospitals are careful about which medications they use for induction after a prior C-section.