NOW Orange-Flavored Psyllium Husk Fiber

Our assessment

The evidence shows that psyllium husk fiber is a well-established source of soluble fiber for digestive health. Our assessment: this product can be a helpful tool for supporting regularity, but you need to be aware of proper usage and potential side effects. Data on the specific ingredient calcium is provided for safety context, but the primary active ingredient here is psyllium fiber.

How it works

Psyllium husk works by absorbing water in your digestive tract, forming a gel-like bulk that helps soften stools and promote regular bowel movements. While psyllium is the main ingredient, the product label also lists calcium. For calcium, the mechanism involves bone mineralization — it supports bone density and mineral deposition — and it also aids in neuromuscular relaxation and nerve signaling [NIH ODS].

Safety profile

FDA has received 592,059 total adverse event reports across all products. For psyllium specifically, side effects can include gas and bloating if you increase your dose too quickly. Regarding the calcium component, data shows that high levels of calcium in the blood and urine can cause poor muscle tone, poor kidney function, low phosphate levels, constipation, nausea, weight loss, extreme tiredness, frequent need to urinate, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS]. Some research also suggests high calcium intakes might increase the risk of heart disease and prostate cancer [NIH ODS].

Our recommendation

Start with a low dose and increase gradually over several days. Always take psyllium with at least 8 ounces of water to prevent choking or intestinal blockage. Be aware that calcium can reduce the absorption of medications including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. If you take any of these medications, separate your psyllium and supplement intake by at least 2 hours.

Supplement labels contain several key sections regulated by the FDA:

• Serving Size — The recommended amount per dose. Always check this — some products require multiple capsules per serving.
• Amount Per Serving — Shows the quantity of each nutrient in the product, typically in IU (International Units), mg (milligrams), or mcg (micrograms).
• % Daily Value (%DV) — Indicates how much a nutrient in a serving contributes to a daily diet. 5% DV or less is low; 20% DV or more is high.
• Other Ingredients — Lists inactive ingredients like fillers, binders, and capsule materials (e.g., gelatin, cellulose, magnesium stearate).
• Suggested Use — The manufacturer's recommended directions for taking the supplement, including timing and dosage.

Source: FDA Dietary Supplement Labeling Guide