Is Evening Primrose Oil Safe for Kidney Stones? (Safe)
mg oxalate
per serving
Serving: 1 serving (100 g)
Verdict: 🟢 Safe
Per 100g: 0 mg
Data: Harvard T.H. Chan SPH (2024)
What this means: Evening Primrose Oil is rated Safe (🟢). At 0 mg oxalate per serving, it's well under the 25 mg safety threshold. You can include it regularly in a kidney stone diet. Pair it with calcium-rich foods (dairy, fortified plant milks) for additional protection, and drink plenty of water throughout the day.
Among condiments, Evening Primrose Oil sits well below the category average of 8 mg. For context, 133 out of 141 condiments (94%) are rated 🟢 Safe (under 25 mg oxalate/serving). The average condiments in our database has 8 mg oxalate per serving — which means Evening Primrose Oil is 100% below the category norm. Within its specific category, Evening Primrose Oil ranks among the lower-oxalate options. This context matters because two 'Safe' foods can have very different oxalate levels — one might have 5 mg while another has 24 mg. Both are Safe, but the first gives you more dietary flexibility. Browse all condiments rated Safe to compare within the same verdict level.
Why does the safe threshold matter?
The 25 mg line is the reference point clinicians use to separate everyday foods from ones that need caution. Every value on this page traces back to Harvard's 2024 lab analysis, so the threshold is applied to measured data rather than estimates. Evening Primrose Oil comes in at 0 mg oxalate per 1 serving (Safe) in the measured database.
Can I eat this food every day?
For Safe foods (under 25 mg/serving), daily use is generally fine. Caution and Avoid foods work better as occasional items — rotate them with safer options so no single high-oxalate food becomes a habit. Applied to Evening Primrose Oil: 0 mg oxalate per 1 serving — Safe per Harvard (2024).
Where does the oxalate data come from?
Every oxalate figure is sourced from Harvard T.H. Chan SPH (2024), distributed via the OHF database. The values come from actual lab measurements of the foods — not from database averages or estimates. For context, Evening Primrose Oil measures 0 mg per 1 serving, rated Safe.
Should I also check sodium and calcium?
Definitely. Oxalate is only part of the story — high sodium raises calcium in urine, and dietary calcium (from food, not pills) binds oxalate in the gut. The food's main page lists both, so it's worth checking before you plan around it. Evening Primrose Oil comes in at 0 mg oxalate per 1 serving (Safe) in the measured database.