Is Swiss Chard High in Oxalates?

Is Swiss Chard High in Oxalates?

If you’re wondering “is swiss chard high in oxalates,” here’s the short answer.

Swiss Chard contains about 350mg of oxalates per 1/2 cup cooked (88g). That is considered very high compared to other foods. Swiss chard has about 350mg of oxalates per half cup cooked. That is 3.5 times the entire daily budget in one serving.

To put that in perspective, most kidney stone dietitians recommend staying under 100mg of oxalates per day. A single serving of swiss chard uses 350% of that budget.

How Does This Compare?

Swiss chard is the second-highest oxalate green after spinach (755mg). Beet greens come next at about 275mg. Kale is dramatically lower at 17mg per cup.

Who Should Watch Their Intake?

Swiss chard is often marketed as a nutritious dark leafy green, but its extreme oxalate content makes it a poor choice for anyone managing kidney stones. Even healthy individuals should limit intake.

Lower-Oxalate Alternatives

  • Kale (17mg/cup)
  • Romaine lettuce (<1mg/cup)
  • Collard greens (moderate)
  • Bok choy (10mg/cup)

What Are Oxalates?

Oxalates (oxalic acid) are natural compounds found in many plants. Your body also produces them as a metabolic byproduct. In small amounts, they pass through your system without issues.

The problem starts when oxalate intake is high and calcium intake is low. Oxalates bind to calcium in the kidneys and form calcium oxalate crystals, the most common type of kidney stone. About 80% of kidney stones are calcium oxalate.

How to Reduce Oxalate Absorption

  • Pair high-oxalate foods with calcium. Eating calcium-rich foods (like cheese or yogurt) at the same meal binds oxalates in the gut before they reach the kidneys.
  • Cook your vegetables. Boiling reduces oxalate content by 30-50% because oxalates leach into the water. Steaming helps less.
  • Drink plenty of water. Staying hydrated dilutes oxalate concentration in urine, reducing crystal formation.
  • Spread intake across meals. A moderate-oxalate food at each meal is better than a high-oxalate food all at once.

The Bottom Line

Swiss Chard is very high in oxalates. If you have a history of kidney stones or are on a low-oxalate diet, limit or avoid it. There are good alternatives that give you similar nutrition without the oxalate load.

Want Help Building a Diet That Works for You?

Tracking oxalates is just one piece of the puzzle. A health coach can help you build a whole-food eating plan that accounts for oxalates, inflammation, gut health, and your personal goals. Book a free discovery call to get started.

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Disclaimer: Oxalate values are approximate and based on Harvard T.H. Chan School of Public Health. Values can vary by growing conditions, preparation method, and brand. This content is for informational purposes only and does not constitute medical advice. Consult a healthcare provider or registered dietitian for personalized guidance. Last verified March 2026.