NOW Foods Supplements, Glucomannan (Amorphophallus konjac) 575 mg, Supports Regularity*, Healthy Weight Management*, 180 Veg Capsules

Clinical trials typically use 3 g daily (1 g before each main meal). NOW Foods Glucomannan 575mg delivers 575mg glucomannan per capsule (3 capsules = 1,725mg per serving), which we classify as Subtherapeutic relative to that range.

See the "Also consider" section below for two alternatives. Choose based on form preference (Capsule vs alternatives), dose adequacy, and third-party testing.

Yes — GMP Certified, Third-Party Tested. Third-party testing verifies ingredient identity and label accuracy.

NOW Glucomannan is generally safe when taken as directed with a full glass of water. It is a natural soluble fiber from konjac root. Always take capsules with at least 8 ounces of water to prevent the fiber from expanding before reaching the stomach.

Glucomannan powder can pose a choking risk if taken without adequate water, as it absorbs up to 50 times its weight in water and expands rapidly. Capsule form is much safer than loose powder because it reaches the stomach before expanding. Always take with a full glass of water.

Common side effects include mild bloating, gas, or loose stools, especially when first starting. These typically resolve as your digestive system adjusts. Start with a lower dose and increase gradually to minimize GI discomfort.

Glucomannan may affect the absorption of some oral medications because it forms a gel in the stomach. Take medications at least 1 hour before or 4 hours after glucomannan to avoid potential interactions. Consult your healthcare provider for specific guidance.

Pregnant or breastfeeding women should consult their healthcare provider before taking glucomannan or any fiber supplement. While konjac fiber is a natural food ingredient, its effects on pregnancy have not been extensively studied.

The recommended serving is 3 capsules (1,725mg total) taken 30-60 minutes before a meal with at least 8 ounces of water. You can take up to 3 servings daily (before each meal) for a total of 5,175mg, which falls within the clinical dose range.

Take glucomannan 30-60 minutes before meals with a full glass of water. This timing allows the fiber to expand in the stomach and promote a feeling of fullness before you begin eating, which may help reduce overall calorie intake.