How Much Oxalate Is in Black Walnut Hull Extract?
mg oxalate
per serving
Serving: 1 serving (100 g)
Verdict: 🟢 Safe
Per 100g: 3 mg
Data: Harvard T.H. Chan SPH (2024)
Here's the takeaway: Black Walnut Hull Extract earns a Safe rating (🟢) at 3 mg oxalate per serving. Being under 25 mg means it fits comfortably in everyday eating. Keep your usual habits — adequate fluids and calcium in meals — and Black Walnut Hull Extract poses no special concern.
Putting Black Walnut Hull Extract in context: it lands well below the category average of 34 mg. In the database, 56% of nuts & seeds (29 of 51) fall in the 🟢 Safe group (under 25 mg oxalate/serving). The typical nuts & seeds here averages 34 mg oxalate per serving, so Black Walnut Hull Extract runs 92% below that baseline. That places it among the lower-oxalate options in its category. Why this matters: the gap between two Safe foods can be wide — one may hold 5 mg oxalate while another sits at 24 mg. The lower one leaves more room in your day. See all nuts & seeds rated Safe for a full side-by-side.
Why does oxalate per 100g matter?
Normalizing to 100 grams removes serving-size differences, so you can judge which food is genuinely denser in oxalate. It matters most when you eat a bigger or smaller portion than the listed serving. For Black Walnut Hull Extract, the measured oxalate value is 3 mg per 1 serving (Safe).
How accurate is the oxalate measurement?
The measurements use ion chromatography, the accepted reference method for oxalate. That means real lab values for each food rather than inferred numbers. Some natural variation exists between samples, but this is the strongest published data set. For context, Black Walnut Hull Extract measures 3 mg per 1 serving, rated Safe.
How does this compare to other foods?
Foods under 25 mg per serving are rated Safe. Foods between 25-99 mg are Caution. 100+ mg is Avoid. Check the food's category page on OxalateWatch to see how it compares to similar foods. Black Walnut Hull Extract comes in at 3 mg oxalate per 1 serving (Safe) in the measured database.