Herb Pharm Willow Bark

Our assessment

The evidence shows that for the specific product Herb Pharm Willow Bark, we cannot make a direct assessment because the data provided does not contain any information on willow bark. The only ingredient data available is for Calcium [NIH ODS]. Our assessment is that without specific data on this product, you should be cautious. The FDA has received 592,059 total adverse event reports across all supplements, but data for this specific product is not available [FDA data].

How it works

Since the only ingredient data provided is for Calcium, we can explain how that mineral works. Calcium supports bone mineralization by helping deposit minerals into your bone matrix, and it supports neuromuscular relaxation by aiding nerve signaling and muscle relaxation [NIH ODS]. For the willow bark ingredient itself, specific mechanism data is not available.

Safety profile

For Calcium, the safety data shows that high calcium intakes might increase the risk of heart disease and prostate cancer. High levels 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]. For the Herb Pharm Willow Bark product specifically, side effect data is not available from the provided FDA data [FDA data].

Our recommendation

We cannot recommend this specific product because the data provided contains no information on willow bark itself. If you are considering this supplement, be aware that calcium can reduce the absorption of several medications including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. Because data is not available for the primary ingredient, we recommend consulting your healthcare provider before use [NIH ODS].

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