Is Olive oil Safe for Kidney Stones? (Safe)
mg oxalate
per serving
Serving: 1 Tbsp (14 g)
Verdict: 🟢 Safe
Per 100g: 1 mg
Data: Harvard T.H. Chan SPH (2024)
In practical terms, Olive oil is a low-risk food for kidney stone patients. Its 0 mg oxalate per serving stays under the 25 mg line, so it can appear in your regular rotation without extra calculation. As always, staying hydrated and getting dietary calcium supports stone prevention.
Among condiments, Olive 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 Olive oil is 100% below the category norm. Within its specific category, Olive 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. Olive oil comes in at 0 mg oxalate per 1 Tbsp (Safe) in the measured database.
Can I eat this food every day?
If it's in the Safe zone (under 25 mg/serving), yes — it can be a regular part of your diet. For Caution or Avoid foods, frequency matters. Rotate them with lower-oxalate options throughout the week. Applied to Olive oil: 0 mg oxalate per 1 Tbsp — 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, Olive oil measures 0 mg per 1 Tbsp, rated Safe.
Should I also check sodium and calcium?
Yes — kidney stone risk isn't just about oxalate. High sodium increases urinary calcium (a stone promoter). Adequate dietary calcium (from food, not supplements) actually binds oxalate in your gut. Check the food's full nutrition page for the complete picture. For Olive oil, the measured oxalate value is 0 mg per 1 Tbsp (Safe).