Organic Spinach (Palak)
Iron-rich, folate-dense, and on the Dirty Dozen list. What you need to know before you buy — and how to cook it to actually absorb the nutrients.
TLDR — What You Need to Know
- Spinach contains 3.5mg iron per 100g — highest among common leafy vegetables — but oxalic acid binds iron and calcium, reducing absorption by up to 80%
- Blanching spinach and discarding the water reduces oxalate content significantly, improving mineral bioavailability
- Folate content (194µg/100g) is genuine and well-absorbed — critical for pregnant women and anyone at risk of neural tube defects
- Vitamin K is high — relevant for anyone on blood-thinning medications like warfarin
- Spinach is on the EWG Dirty Dozen list — one of the highest pesticide-residue vegetables when grown conventionally
- Adding a squeeze of lemon (Vitamin C) to cooked spinach significantly enhances non-haem iron absorption
What Is Spinach (Palak)?
Spinach (Spinacia oleracea) is a cool-season leafy green originating from ancient Persia and now grown across India year-round, with peak seasons in winter. It belongs to the Amaranthaceae family — the same family as amaranth (rajgira) and beetroot.
In Indian cooking, spinach (palak) appears in everything from palak paneer and palak dal to smoothies and traditional iron tonics for postpartum women. It earned its global reputation partly from the Popeye cartoon — a story rooted in a genuine nutritional fact (high iron) that was later complicated by a harder truth: the iron is mostly unavailable to the body as consumed.
Understanding spinach properly means understanding both its genuine strengths and its real limitations.
Nutritional Profile
Spinach — Nutrition Facts (Raw, per 100g)
Per 100g raw
| Nutrient | Amount | % Daily Value |
|---|---|---|
| Energy | 23 kcal | — |
| Protein | 2.9 g | 6% |
| Total Fat | 0.4 g | — |
| Carbohydrates | 3.6 g | — |
| Dietary Fibre | 2.2 g | 8% |
| Iron | 3.5 mg | 19% |
| Calcium | 99 mg | 8% |
| Vitamin C | 28 mg | 31% |
| Folate (B9) | 194 µg | 49% |
| Vitamin K | 483 µg | 403% |
| Vitamin A (RAE) | 469 µg | 52% |
| Magnesium | 79 mg | 19% |
| Potassium | 558 mg | 12% |
The Iron Story — Real but Overstated
The Popeye myth was built on real data. Spinach does contain 3.5mg of iron per 100g — more than chicken liver gram for gram, and far above most vegetables. The problem lies in bioavailability.
Spinach is rich in oxalic acid (oxalates), an antinutrient that binds iron and calcium into insoluble complexes in the digestive tract. These complexes cannot be absorbed — they pass straight through. Research estimates that only 1–7% of spinach iron is actually absorbed by the body, compared to 15–35% from haem iron in meat.
What this means in practice:
- Eating 100g raw spinach delivers ~3.5mg iron on paper but roughly 0.07–0.25mg to your blood
- The same quantity of well-cooked lentils (dal) delivers significantly more absorbable iron despite lower raw iron content
- Spinach should never be a primary iron source for anaemia management — it is a supplement to, not a replacement for, better iron sources
How to improve iron absorption from spinach:
- Blanch spinach in boiling water for 2–3 minutes, then discard the water — this leaches out a significant fraction of oxalates
- Add a squeeze of lemon juice (Vitamin C) to finished dishes — ascorbic acid converts non-haem iron to a more soluble form, improving absorption 2–3x
- Avoid combining spinach with other calcium-rich foods in the same meal if iron absorption is the goal
Folate — The Genuine Strength
Unlike iron, folate (Vitamin B9) in spinach is genuine and well-absorbed. At 194µg per 100g, spinach provides nearly half the adult recommended daily intake in a single serving.
Folate is critical for:
- Neural tube formation in early pregnancy — deficiency causes spina bifida and anencephaly
- DNA synthesis — every dividing cell requires folate
- Homocysteine metabolism — high homocysteine is a cardiovascular risk factor; folate reduces it
- Red blood cell formation — folate deficiency causes megaloblastic anaemia, which can be misdiagnosed as iron deficiency anaemia
For pregnant women and women of reproductive age, spinach is one of the most valuable vegetables in the Indian diet. Note that folate is heat-sensitive — steaming preserves more folate than boiling.
Health Benefits
Eye health: Spinach is rich in lutein and zeaxanthin — carotenoids that concentrate in the macula of the eye. Multiple studies associate higher lutein intake with reduced risk of age-related macular degeneration (AMD) and cataracts.
Bone health: Vitamin K activates osteocalcin — a protein required for bone mineralisation. At 483µg per 100g (403% of daily value), spinach is one of the most concentrated Vitamin K sources in the plant kingdom.
Blood pressure: Potassium (558mg/100g) counters sodium’s blood-pressure-raising effects. Dietary nitrates in spinach also convert to nitric oxide in the body, which relaxes blood vessel walls — similar to the mechanism behind beetroot’s performance-enhancing reputation.
Antioxidants: Beta-carotene, Vitamin C, and quercetin in spinach collectively reduce oxidative stress. Anti-inflammatory effects are documented in multiple in-vitro studies, though clinical evidence in humans is less robust.
Side Effects and Who Should Be Cautious
Kidney stone patients: Oxalates in spinach are directly implicated in calcium oxalate kidney stones — the most common type. Those with a history of kidney stones should limit raw spinach significantly and avoid spinach juice.
Blood thinner users (warfarin/acenocoumarol): Vitamin K at 483µg/100g is extremely high — over 4x the daily requirement. Vitamin K counteracts blood-thinning medication. Patients on anticoagulants must keep spinach intake consistent (not zero, but stable) and inform their doctor. Sudden large increases are dangerous.
Hypothyroid patients: Raw spinach contains goitrogens — compounds that interfere with thyroid iodine uptake. Cooking largely deactivates goitrogens. Hypothyroid patients should avoid raw spinach (salads, smoothies) and consume only cooked spinach in moderate quantities.
Gout patients: Spinach contains purines, though at moderate levels. Gout patients should moderate intake.
Organic vs Conventional Spinach
Spinach is consistently listed on the Environmental Working Group’s Dirty Dozen — a ranking of fruits and vegetables with the highest detectable pesticide residues after washing. In US and EU testing, spinach samples have shown residues of permethrin, spinosad, and other insecticides.
The reasons spinach accumulates pesticide residues are structural: the large, soft, slightly wrinkled leaves trap pesticide spray, and the vegetable is typically harvested with a short gap after spraying. Washing removes surface residues but does not eliminate systemic pesticides.
For spinach specifically, buying organic is one of the most evidence-backed choices in the vegetable category — particularly relevant for children and pregnant women who are the most vulnerable to pesticide exposure.
How to Select and Store
Selection: Look for deep green leaves, firm stems, and no yellowing or wilting. Avoid bunches with slimy leaves (bacterial decomposition already underway) or brown edges. Baby spinach has lower oxalate content than mature leaves.
Storage: Spinach is highly perishable. Keep unwashed in the refrigerator in a slightly damp cloth or loosely sealed bag. Use within 2–3 days of purchase. Once wilted, spinach is still usable in cooked dishes but nutrient content has degraded.
Do not store near ethylene-producing fruits (apples, bananas) — ethylene accelerates yellowing.
Spinach vs Other Leafy Greens — Iron and Folate
Leafy Greens Comparison — Iron and Folate per 100g
| Nutrient | Spinach (Palak) | Methi (Fenugreek Leaves) | Amaranth (Rajgira Leaves) |
|---|---|---|---|
| Iron (mg) | 3.5 | 1.9 | 3.9 |
| Iron bioavailability | Low (oxalates) | Moderate | Moderate-High |
| Folate (µg) | 194 | 57 | 85 |
| Calcium (mg) | 99 | 395 | 215 |
| Calcium bioavailability | Low (oxalates) | Low (oxalates) | Moderate |
| Vitamin C (mg) | 28 | 3 | 43 |
| Oxalate content | Very High | Moderate | Moderate |
| Calories (kcal) | 23 | 49 | 23 |
Amaranth leaves have comparable iron with better bioavailability. Methi provides superior calcium. Spinach leads on folate.
Classic spinach and cottage cheese curry. The lemon squeeze at the end is not optional — it converts non-haem iron to absorbable form and brightens flavour.
Key Ingredients
300g fresh spinach (palak), washed · 200g paneer, cubed · 1 medium onion, finely chopped · 2 tomatoes, chopped · 1 tsp cumin seeds · 1 tsp ginger-garlic paste · 1/2 tsp turmeric · 1 tsp coriander powder · 1/2 tsp garam masala · 1 tbsp oil or ghee · Salt to taste · Juice of half a lemon
How to Test for Pesticide Contamination (Home Method)
Home Test: Pesticide Residue Wash Test for Spinach
Steps
- 1 Take 5-6 spinach leaves and place in a bowl of room temperature water
- 2 Add 1 tsp of turmeric powder and stir
- 3 Let the leaves soak for 10 minutes
- 4 Observe the water colour and any oily film on surface
- 5 For comparison, soak a second set of leaves after washing under running water for 30 seconds
Pure / Pass
Water remains relatively clear or faintly yellow from turmeric alone. No oily sheen or unusual residue visible after washing.
Adulterated / Fail
Water turns grey, greenish, or develops an oily film despite washing. This indicates surface pesticide residue. Switch to organic or intensify washing protocol — but note systemic pesticides cannot be washed off.
Available at Organic Mandya
Organic Spinach (Palak)
Dirty Dozen certified reason to go organic. Grown without synthetic pesticides. Folate-rich, iron-dense, freshly harvested.
Frequently Asked Questions
Q Is spinach actually a good iron source?
Is spinach actually a good iron source?
On paper, yes — 3.5mg per 100g is impressive. In practice, oxalic acid binds the iron and prevents absorption. Only 1-7% of spinach iron reaches your bloodstream. Lentils, horsegram, and sesame are far more reliable iron sources. Spinach is excellent for folate, Vitamin K, and eye health — but should not be relied upon as a primary iron source for anaemia.
Q Does cooking destroy spinach nutrients?
Does cooking destroy spinach nutrients?
Cooking reduces Vitamin C and folate (heat-sensitive). However, it also reduces oxalates and goitrogens, making other nutrients MORE available. Blanching and discarding the water removes the most oxalates. Steaming retains more folate than boiling. For iron absorption, cooked spinach with lemon is strictly better than raw spinach.
Q Can I eat spinach every day?
Can I eat spinach every day?
For most healthy adults, yes in moderation. Concerns arise for: kidney stone patients (oxalates), people on blood thinners (Vitamin K), and hypothyroid patients eating raw spinach. 100-150g cooked spinach daily is well-tolerated by the majority of people.
Q Why is spinach on the Dirty Dozen list?
Why is spinach on the Dirty Dozen list?
Spinach leaves are soft, wrinkled, and absorbent — they trap pesticide spray efficiently. Government testing consistently finds multiple pesticide residues on conventionally grown spinach even after washing. The Dirty Dozen is updated annually by the Environmental Working Group based on USDA pesticide testing data. Buying organic significantly reduces but does not eliminate all pesticide exposure.
Last updated: March 2026
Disclaimer: This article is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your doctor or a qualified healthcare provider before making dietary changes, especially if you have a medical condition.