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9 min
02/07/2026
This World Chocolate Day, celebrated every year on July 7, is a good moment to consider whether your craving for dark chocolate before your period is your body actually telling you something useful. The short answer is yes: dark chocolate, varieties with 85% cocoa or higher, contains magnesium, iron, copper, and flavonoids, all of which play documented roles in easing the physical and emotional symptoms of premenstrual syndrome (PMS). Here is what the science says, and where the myths end.
World Chocolate Day marks the introduction of chocolate to Europe in the 16th century, ushering in a shift from the bitter brews of the Aztecs and the Mayans to the world’s first sweet chocolate bars. For generations, the connection between women and chocolate, especially in the days before and during menstruation, has been explained away as emotional eating or hormonal weakness, and then comes the dread and guilt afterwards. But nutritional science tells a more interesting story, and World Chocolate Day 2026 is the perfect occasion to explore it through multiple peer-reviewed studies and a nutritionist who has specifically examined the relationship between dark chocolate and PMS symptoms.
Dark chocolate is defined by its cocoa solids content, and the higher the percentage, the more room there is for the minerals, flavonoids, and neuroactive compounds that give it its health relevance. Per 100g of dark chocolate, there is, as per the USDA, 2018 figures, 70-85% cacao solids and:
Magnesium: Approximately 228mg per 100g, meeting about 70% of the recommended daily intake for women.
Iron: About 11.9mg per 100g, amounting to 40% of the RDA (Recommended Dietary Allowance) for women.
Copper: 1.77mg per 100g, meeting 88.5% of the RDA. It is essential for connective tissue health and iron absorption.
Theobromine: Roughly 802mg per 100g, which is a stimulant compound that can help improve mood.
Tryptophan and phenylalanine: Amino acids that are precursors to serotonin and dopamine, which are the two neurotransmitters directly implicated in PMS mood symptoms.
Flavanols and polyphenols: Studies show dark chocolate has powerful antioxidant compounds with documented anti-inflammatory, cardiovascular, and neuroprotective properties.
Fibre: Approximately 11g per 100g, which supports digestion.
This combination makes dark chocolate uniquely relevant to women's hormonal health, which is why dark chocolate is beneficial in moderate amounts during PMS or periods.
Here’s the science side of things for World Chocolate Day: magnesium, mood swings, hormones, and iron connected to dark chocolate and how they help.
Magnesium deficiency is more common in women, and the consequences are acutely felt in the premenstrual phase. Studies show that magnesium helps to relax muscles and may ease uterine contractions and pain. It is also possible that magnesium can inhibit prostaglandin production, which is a hormone-like lipids that stimulate uterine contractions and is the direct cause of cramping. Many studies have highlighted a positive correlation between magnesium administration and relief or prevention of these symptoms.
Research shows that serotonin, the neurotransmitter that acts as a messenger between your nerve cells and your brain, is altered during this period, which leads to irritability, depression and increased pain sensitivity. Not only does serotonin regulate mood and is linked to happiness and relief from anxiety, but it also supports sleep, digestion, bone health, and blood clotting.
Dark chocolate helps support the function of this overworked neurotransmitter in today’s world. Chocolate also helps with the function of the neurotransmitter dopamine, which helps support mood and cognition.
Iron goes hand in hand with copper and magnesium to boost its absorption in the bloodstream. All three are present in dark chocolate, and consuming it will be particularly beneficial for women with low iron levels and those who have heavy periods.
Studies show that eating 40g of dark chocolate for 14 days reduced cortisol (a stress hormone) excretion in urine. It also reduced stress and improved the gut environment.
A study was conducted on 50 menstruating teenagers at a boarding school in Indonesia. It was found that those in the group who ate up to 40 grams of a 69% dark chocolate bar daily for the first 3 days after menstruation had significantly less menstrual pain than those who drank 40 grams of chocolate milk daily for the same period.
A second leg of the study among 40 menstruating students at a university in Indonesia found that dark chocolate significantly reduced menstrual pain. A third study divided 90 students into three groups: consuming dark chocolate, milk chocolate, and no chocolate, respectively, and found that the dark chocolate group had the best improvement in menstrual pain.
This study was conducted among 90 nursing students aged 18-25 with primary dysmenorrhea (painful menstrual cramps). It evaluated whether dark chocolate and music medicine could reduce menstrual pain and anxiety. The study found that both dark chocolate (as a non-pharmacological intervention) and music medicine had a significant effect on reducing menstrual pain and anxiety in young women.
A 2025 study published in the journal Nutrients studied the acute effects of 85% dark chocolate supplementation on cognitive and physical performance, as well as delayed-onset muscle soreness (DOMS) in 15 trained female CrossFit athletes across four distinct hormonal phases: menstrual, follicular, luteal, and premenstrual syndrome (PMS).
The participants consumed 30g of dark chocolate per day for three days, followed by performance testing on day four. The study found that dark chocolate, rich in flavonoids, polyphenols, magnesium, and theobromine, may exert anti-inflammatory, analgesic, and neuroprotective effects, with benefits most pronounced during the premenstrual phase.
This systematic literature review, published in the journal Gynaecological Endocrinology and available on PubMed Central, consolidates evidence from multiple trials. The review found that magnesium supplementation is effective in the prevention of dysmenorrhea and premenstrual syndrome and suggests it may represent a viable treatment for these conditions. Since dark chocolate at 70-85% cocoa delivers up to 65mg of magnesium per 28g serving, it contributes to the dietary magnesium intake that this review identifies as relevant.
Many doctors have agreed on the internet that dark chocolate, in particular, can help improve mood and reduce period discomfort because it triggers the release of serotonin and endorphins, which help reduce stress, anxiety, and irritability associated with PMS. Your cravings are actually signalling something during PMS: it is a natural way of seeking hormonal and emotional balance.
Studies suggest that eating 40-120 grams of dark chocolate daily during your period may help reduce pain. Here’s what a nutritionist says:
Aim for approximately 30g per day of 70% or more dark chocolate during the 3-5 days leading up to and during your period.
Choose minimally processed bars with no added milk solids, no vegetable oils, and low to zero sugar.
Pair it with a Vitamin C source like orange, amla, or juices to enhance iron absorption from the cocoa in dark chocolate.
A 70-85% dark chocolate bar that is approx 100g delivers roughly 228mg of magnesium.
Important note: If your PMS symptoms are severe, debilitating, or accompanied by heavy bleeding, please consult a gynaecologist or registered dietitian. This article is not a substitute for medical advice.
World Chocolate Day is a reminder that dark chocolate is good for you, in moderate amounts. There’s a reason why, before chocolate bars existed, cocoa was something that was consumed by ancient civilisations and even worshipped. So ditch the guilt and bite into that chocolate bar when your body demands some extra love, before and during your menstruation.
Streit, L., reviewed by Rose-Francis, K. (2022). Can Chocolate Lessen Period Cramps? Healthline. https://www.healthline.com/nutrition/does-chocolate-help-cramps
Dr Amrapali Dixit, Miracles Health (2025). Can Chocolate Actually Help During Periods? https://www.miracleshealth.com/blog/can-chocolate-actually-help-during-periods
Safari, K. et al. (2025). Dark Chocolate Mitigates Premenstrual Performance Impairments and Muscle Soreness in Female CrossFit Athletes. Nutrients, 17(8), 1374. https://pmc.ncbi.nlm.nih.gov/articles/PMC12029999/
Turkmen, S. et al. (2022). The Effect of Dark Chocolate and Music on Pain and Anxiety in Young Women with Primary Dysmenorrhea: Randomised Controlled Trial. European Journal of Obstetrics & Gynaecology and Reproductive Biology. https://www.sciencedirect.com/science/article/abs/pii/S1876382022000932
Parazzini, F. et al. (2017). Magnesium in the Gynaecological Practice: A Literature Review. Gynaecological Endocrinology, 33(4), 295-303. https://pmc.ncbi.nlm.nih.gov/articles/PMC5517000/
Dark chocolate may help reduce menstrual cramp pain for some people. Magnesium can relax uterine muscles and may reduce prostaglandin-related pain, though evidence remains limited and not definitive.
