Research suggests compounds found in cilantro and coriander seeds could improve insulin function and blood sugar regulation, although experts say eating the fresh herb has not been proven to produce significant benefits for people with diabetes.
By yourNEWS Media Newsroom
NEW ORLEANS — Cilantro, the leafy green herb commonly used in salsa, tacos and other dishes, is drawing attention for its potential to help regulate blood sugar after studies identified plant compounds that may improve insulin activity and glucose metabolism. Nutrition experts caution, however, that most supporting research involves concentrated extracts or coriander seeds rather than the small amounts of fresh leaves typically consumed in meals.
Dr. Ronald R. Quinton, medical director of the Goldring Center for Culinary Medicine at Tulane University School of Medicine, told the Daily Mail in a Nov. 1 report examining cilantro’s health benefits that the herb contains flavonoids, polyphenols and essential oils that may encourage pancreatic cells to release insulin. These compounds may also help improve insulin sensitivity, allowing the body to use glucose more efficiently and potentially reducing blood sugar spikes after meals.
Laboratory and animal research has identified several possible mechanisms behind those effects, including increased insulin secretion and changes in enzymes involved in carbohydrate metabolism. A 2023 scientific review examining medicinal plants and glucose regulation found that extracts from Coriandrum sativum, the plant that produces both cilantro leaves and coriander seeds, reduced blood glucose levels in diabetic animal models. Researchers also identified antioxidant compounds that may help protect insulin-producing pancreatic cells.
Human research has produced encouraging but preliminary findings. A randomized, double-blind, placebo-controlled study published in Preventive Nutrition and Food Science examined 40 adults with type 2 diabetes who received either 1,000 milligrams of coriander seed powder daily or a placebo for six weeks. Participants taking the supplement experienced reductions in fasting blood glucose, insulin resistance and several cholesterol measurements.
Average fasting blood glucose in the coriander group declined from approximately 156 to 130 milligrams per deciliter, a reduction of nearly 26 points. Researchers also reported improvements in total cholesterol, triglycerides and low-density lipoprotein cholesterol. The placebo group experienced little change in blood sugar over the same period.
Although the results suggest coriander compounds may have metabolic benefits, the study involved only 40 participants and lasted six weeks. Researchers used standardized seed powder rather than fresh cilantro leaves, leaving unanswered whether ordinary dietary consumption would produce comparable effects.
Caroline Meehan, a registered dietitian and clinical nutrition manager at Penn Medicine in Philadelphia, emphasized that distinction when discussing the findings with the Daily Mail.
“Some research suggests compounds in cilantro may influence insulin and glucose metabolism, but most of that evidence comes from laboratory and animal studies using concentrated extracts,” Meehan said. “There is limited evidence that eating fresh cilantro will meaningfully lower blood sugar. Think of cilantro as a flavorful and nutritious addition to a balanced diet, rather than a strategy for managing blood sugar.”
Cilantro nevertheless offers nutritional benefits beyond its potential effects on glucose regulation. According to Cleveland Clinic nutrition guidance, the herb provides vitamins A, C and K, along with antioxidants such as flavonoids and carotenoids. A quarter cup contains approximately one calorie, making it a low-calorie ingredient that can add flavor to meals without significant amounts of sugar, fat or sodium.
The herb has also attracted attention for possible antimicrobial properties. Laboratory studies indicate that certain compounds in coriander, including linalool and other essential oil components, can inhibit some bacteria and fungi. However, Quinton and Meehan cautioned that these experimental findings do not establish that eating cilantro can prevent food poisoning or treat infections.
Claims that cilantro removes heavy metals or other toxins from the body are similarly unsupported by strong human clinical evidence. Although certain plant compounds have been investigated for their interactions with metals, there is insufficient evidence that consuming cilantro meaningfully eliminates accumulated toxins. The liver and kidneys already perform the body’s primary detoxification functions.
Researchers have also examined coriander’s potential anti-inflammatory and antioxidant effects. A 2026 scientific review of culinary herbs and metabolic health summarized several clinical studies involving coriander preparations and reported improvements in selected blood glucose, cholesterol and oxidative stress measurements. The authors nevertheless emphasized the need for larger, more rigorous trials to establish effective doses and long-term health outcomes.
While cilantro consumed in normal food quantities is generally considered safe, concentrated supplements require greater caution. Quinton warned that large doses could interact with diabetes medications, potentially increasing the risk of hypoglycemia, or low blood sugar. Because cilantro contains vitamin K, individuals taking warfarin or similar medications should also maintain consistent dietary intake and consult their healthcare providers before introducing concentrated products.
The National Institutes of Health’s National Center for Complementary and Integrative Health similarly cautions that reliable evidence is lacking to support herbal supplements as treatments for diabetes or its complications. Supplements should not replace prescribed medications, appropriate nutrition or established blood sugar management strategies.
For people who enjoy cilantro, incorporating the fresh herb into salads, soups, vegetable dishes, beans and homemade salsa can provide flavor and additional nutrients without substantially increasing calories or sodium. Its potential metabolic benefits remain an area of scientific interest, but current evidence does not establish that ordinary servings can significantly lower blood sugar.
The research suggests coriander may eventually have a role in complementary approaches to metabolic health, although larger human trials are needed to determine whether those benefits extend to fresh cilantro consumed as part of a normal diet.
Original article
Comments