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Greens Powders: Mystery or Magic?
Americans are spending billions on superfood and green powders.
But are powdered supplements a scam?
-Alexa Gagosz, Boston Globe 4/6/26
Greens powders include a wide variety of superfoods (fruits and vegetables) that are freeze dried and ground down to a fine powder that mixes easily into drinks or food. Greens powders have become a popular way for people to reach the daily recommended amount of vitamins and minerals. Most physicians recommend at least 4 to 5 servings of vegetables each day. Greens powders contain a combination of vegetables, fruits, seaweeds, algae, and/or grasses that are processed and provide vitamins, minerals, and antioxidants. The powders can include 25 to 40 or more ingredients. As an example, common ingredients in greens powders are kale and spinach because they are rich in vitamins A, C, E and K. Natural sugar substitutes may be added to improve the flavor.
The superfood categories with the most scientific research behind their health benefits are dark, leafy greens, berries, legumes, beans, nuts, seeds, and cruciferous vegetables such as broccoli, brussels sprouts, and cauliflower. The most popular superfoods include: kale, spinach, blueberries, avocado, chia seeds, walnuts, beans, and garlic. Eating the rainbow of colorful fruits and vegetables is also popular with an emphasis on red foods such as beets, strawberries, and tomatoes, orange/yellow carrots, corn and sweet potatoes, green asparagus, brussels sprouts and leafy greens, blue or purple berries, cabbage, and brown mushrooms.
The nutritional content in greens powders varies by brand, but generally speaking 1 tablespoon serving contains: 3 grams of protein, 6 grams of carbohydrates, 18% of the daily value of iron, 60% of the daily value of Vitamin A and is a good source for calcium, iodine, selenium, chromium, potassium, and Vitamin C. While greens powders are generally marketed as part of wellness initiatives, for a variety of reasons, many nutritionists are less supportive of their usefulness.
Greens powders are popular because many people believe they reduce inflammation, aid in digestion, and can help manage stress. They are also viewed as convenient for “on the go” nutrition.
Although greens powders can be beneficial when used as a supplement where there are nutritional deficiencies and some people feel better using them, many dietitians believe it is better and most effective to get the proper nutrients into your diet by eating whole fruits, vegetables, and other nutrient-dense foods. While the powders may be useful to help fill nutritional gaps, the powders do not replace whole vegetables due to lower fiber content and lower nutrient stability. The processing and drying methods of the powder reduce the stability of the nutrients. Whole fruits and vegetables are full of fiber and pulp which is proven to help with digestion and fortify energy levels.
Before purchasing and using greens powders, read the label carefully (note many labels are deliberately vague citing proprietary blends without giving specific information). It is best to find a supplement that has been third party tested to verify the ingredients.
A few other thoughts to consider when making decisions about greens powders include the following:
The U.S. Food and Drug Administration does not approve dietary supplements so it is difficult to know if all green powders are safe. It is wise to research the manufacturer’s sourcing and their testing procedures to help ensure you are taking a safe product. Federal rules prevent supplement makers from making claims that their products can treat or cure disease.
Whereas water-soluble vitamins, such as Vitamins C and B, will be passed through your urine if you consume more than you need, fat-soluble vitamins such as A, D, E and K, can build up to toxic levels, so be cognizant about serving size.
Consider how the powder will interact with medications you may be taking or your specific health conditions. Some greens powders have nutrients that interact with medications including antibiotics, cholesterol medications, weight-loss drugs, and blood thinners.
A month’s supply of some brands can cost close to $100. Consider whether this money could be better spent to purchase fresh food or to schedule consultations with a registered dietician to gain expert advice and receive personalized dietary recommendations.
If you are looking to increase your intake of fruits and vegetables, a green smoothie may be a healthier option than powders, since the entire vegetable/fruit is blended into the drink, providing the important fiber that the whole food contains. Dr. Mahtab Jafari, a pharmaceutical sciences professor at UC Irvine believes that, "The marketing is way ahead of the actual science," as it relates to supplements and greens powders. So tread cautiously, and speak with your medical team before embracing the latest social media blitz. Remember, it is always wise to consult with your primary care physician or a dietitian to make sure the supplement you use will be safe, effective, and right for you.
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