Do Ora Pro Nobis Leaves and Green Powder Need to Be Cooked?

Separating Myth from Science

There’s a belief floating around social media and informal food discussions in Brazil that ora pro nobis leaves must be cooked before eating for them to be safe. This is understandable as many wild plants contain compounds that benefit from cooking, such as oxalates and tannins. However in the case of the species we use, that belief is not supported by science.

The confusion comes from mixing up different plant species with similar names, rather than from evidence showing raw consumption is unsafe. Let’s look at what the scientific literature actually says.

1. Ora pro nobis, aka Pereskia aculeata Miller, Is an Edible, Non-Toxic Plant With a Long History of Human Consumption

Pereskia aculeata Miller, the species used in our green powder, is widely documented as edible. Its fresh leaves are consumed directly in traditional diets, especially in parts of Brazil where it grows naturally and is known as ora-pro-nobis. Studies describe the non-succulent leaves as a traditional vegetable used in green juices, salads, omelets, pies, and stews, and also processed into leaf powder for breads and pastas, and other applications.^1-5

Importantly, P. aculeata leaves are reported in peer-reviewed research as nutrient-rich and non-toxic.^6,7 On a dry-matter basis, 100 g of the leaves provides substantial amounts of protein, dietary fiber, vitamins A and C, and essential minerals. The plant has a long history of safe, traditional consumption- both fresh and dehydrated.

2. An Animal Toxicity Study Found No Adverse Effects

A controlled animal study evaluated the acute toxicity of P. aculeata leaf extract given orally to laboratory rats. The researchers found no clinical signs of toxicity and no histopathological changes in the tissues examined.⁶ This was a single dose study of a leaf extract, not of the whole leaf or the powder, so it supports safety but does not replace long term studies.

These kinds of toxicity studies are exactly how scientists screen for potential food safety risks. In this case, the study reported no observable toxic effects.

3. Raw Leaves Are Documented as Edible in Scientific and Food Resources

Scientific reviews and botanical databases list P. aculeata leaves as edible and nutritious, with raw consumption explicitly noted in many use contexts.¹ The leaves contain a high protein content and are widely referenced as raw leafy greens in botanical and chemical databases.⁸

In addition, P. aculeata is listed among “plantas alimentícias não convencionais” (PANCs), meaning non-conventional food plants in Brazil^4,9,10 which by definition are edible plants consumed traditionally, often raw or lightly prepared in local cuisines.

4. The Source of the Misconception: Species Mix-Up

Species confusion and visible botanical differences

The belief that ora pro nobis leaves must be cooked before consumption does not originate from toxicological evidence related to Pereskia aculeata Miller. Instead, it appears to arise from confusion between different species within the genus Pereskia that share similar common names but differ botanically, nutritionally, and in how extensively they have been studied.

Two species are most commonly confused:

Pereskia aculeata Miller

This is the species traditionally consumed as ora pro nobis and the one supported by scientific literature as edible and non-toxic.¹¹

Key identifying characteristics include:

•   Smaller, thinner, succulent green leaves
•   Leaves typically oval to lanceolate with a softer texture
•   White to cream-colored flowers
•   A climbing or sprawling growth habit
•   Extensive documentation in ethnobotanical, nutritional, and food science literature

This species is the one referenced in studies describing raw consumption, inclusion in salads, and use in fresh or minimally processed preparations.^1,8 In Brazil, Embrapa, Brazil’s federal agricultural research agency, has published a technical circular on ora pro nobis (Pereskia), detailing its cultivation in dense planting systems with successive harvest management, reinforcing its recognition as a studied, edible leafy vegetable suitable for fresh or processed use.¹²

Pereskia grandifolia

This is a different species, sometimes informally referred to by the same common name in certain regions, which contributes to confusion.^13,14

Key distinguishing characteristics include:

•   Much larger, thicker leaves
•   Leaves that are more rigid and leathery in appearance
•   Distinctive purple to pink flowers
•   Primarily ornamental use
•   Far less studied as a food source

Unlike P. aculeata, P. grandifolia does not have the same body of scientific evidence supporting routine dietary consumption, particularly in raw form.

Why this Distinction Matters

Scientific evidence supporting the safety and edibility of ora pro nobis applies specifically to Pereskia aculeata, not to all plants within the Pereskia genus. When recommendations about cooking or caution are made without specifying the species, they can incorrectly be generalized to P. aculeata, despite clear differences in botanical traits and research coverage.

This species-level confusion is common in discussions of non-conventional food plants (PANCs) and highlights the importance of accurate botanical identification when making food safety claims.

Bottom line: Pereskia aculeata Miller = ora pro nobis

Smaller leaves, white flowers, extensively studied, and edible raw or cooked. In Brazil, Embrapa, Brazil’s federal agricultural research agency, has published a technical circular on ora pro nobis (Pereskia), detailing its cultivation in dense planting systems with successive harvest management, reinforcing its recognition as a studied, edible leafy vegetable suitable for fresh or processed use.¹²

5. A Common Follow-Up Question: What About Oxalates?

Oxalates are naturally occurring compounds found in many leafy vegetables. They are discussed in nutrition mainly because they can bind to calcium and, in susceptible individuals, contribute to calcium oxalate kidney stones. Importantly, oxalates are not toxins, and for most healthy people eating a balanced diet, they are not a safety concern.

Oxalate levels in ora pro nobis (Pereskia aculeata) have been directly measured in scientific studies. In one study of cereal bars made with ora pro nobis leaf flour, researchers reported an oxalic acid to calcium ratio of 1.43 and concluded that it did not compromise calcium bioavailability².

For comparison, studies of spinach (Spinacia oleracea) show that the amount of oxalate in the leaves exceeds the amount of calcium, leading to a high oxalate-to-calcium ratio. One analysis of frozen spinach measured a ratio of 4.73 (in mEq), which helps explain why spinach calcium is considered poorly absorbed despite its high mineral content.¹⁵

The two studies used different samples and methods, so the numbers are not directly comparable. Taken together, the available data do not point to an oxalate concern for ora pro nobis eaten in normal food amounts.

6. Ora Pro Nobis in Brazil’s Food Composition Table

In Brazil, ora-pro-nobis is included in the Tabela Brasileira de Composição de Alimentos (TBCA), a national food composition table maintained at the University of São Paulo. Its biodiversity database lists Pereskia aculeata Mill., including entries for raw leaves.¹⁶

Conclusion: Raw Ora Pro Nobis Leaves Are Safe to Eat

Pereskia aculeata Miller is a non-toxic, edible plant species with fresh leaves consumed directly in traditional diets (e.g., salads, fresh preparations).
A peer reviewed acute toxicity study in rats found no adverse effects from a leaf extract.
It is widely documented as an edible leafy vegetable with rich nutrient content.
Misconceptions arise from species confusion, not evidence of risk.

Cooking ora-pro-nobis is a culinary choice, often done for taste or texture, but it is not required to make the leaves safe to eat.

Sources

1. Silva NFN, Silva SH, Baron D, Neves ICO, Casanova F. Pereskia aculeata Miller as a novel food source: a review. Foods. 2023;12(11):2092. doi:10.3390/foods12112092
2. da Cruz GS, da Silva CNP, Gomes-Junior EA, et al. Cereal bar enriched with ora-pro-nóbis (Pereskia aculeata Miller): physicochemical and sensory characterization. J Food Sci Technol. 2024;61(8):1547-1556. doi:10.1007/s13197-024-05924-2
3. Silva DLG, Andrich F, Porciuncula BDA, Batista MA, Terhaag MM, Barros BCB. Nutritional profile and sensory acceptance of sourdough breads enriched with ora-pro-nóbis leaf powder. J Food Sci. 2025;90(10):e70629. doi:10.1111/1750-3841.70629
4. Takeiti CY, Antonio GC, Motta EMP, Collares-Queiroz FP, Park KJ. Nutritive evaluation of a non-conventional leafy vegetable (Pereskia aculeata Miller). Int J Food Sci Nutr. 2009;60(suppl 1):148-160. doi:10.1080/09637480802534509
5. da Silva Porto FG, Campos ÂD, Carreño NLV, Garcia ITS. Pereskia aculeata leaves: properties and potentialities for the development of new products. Nat Prod Res. 2022;36(18):4827-4838. doi:10.1080/14786419.2021.2010070
6. Silva DO, Seifert M, Nora FR, et al. Acute toxicity and cytotoxicity of Pereskia aculeata, a highly nutritious Cactaceae plant. J Med Food. 2017;20(4):403-409. doi:10.1089/jmf.2016.0133
7. Garcia JAA, Corrêa RCG, Barros L, et al. Phytochemical profile and biological activities of ‘Ora-pro-nobis’ leaves (Pereskia aculeata Miller), an underexploited superfood from the Brazilian Atlantic Forest. Food Chem. 2019;294:302-308. doi:10.1016/j.foodchem.2019.05.074
8. Biodiversity for Food and Nutrition Project. Pereskia aculeata. Species database. Accessed October 13, 2026. https://www.b4fn.org/resources/species-database/detail/pereskia-aculeata
9. Fioroto AM, Toniazzo T, Giuntini EB, Oliveira PV, Purgatto E. Mineral nutrients and protein composition of non-conventional food plants (Pereskia aculeata Miller, Sonchus oleraceus L. and Xanthosoma sagittifolium (L.) Schott). J Food Compos Anal. 2024;136:106825. doi:10.1016/j.jfca.2024.106825
10. Sato R, Cilli LPL, Oliveira BE, Maciel VBV, Venturini AC, Yoshida CMP. Nutritional improvement of pasta with Pereskia aculeata Miller: a non-conventional edible vegetable. Food Sci Technol. 2019;39(suppl 1):28-34. doi:10.1590/fst.35617
11. Almeida MEF, Corrêa AD. Utilização de cactáceas do gênero Pereskia na alimentação humana em um município de Minas Gerais. Cienc Rural. 2012;42(4):751-756. doi:10.1590/S0103-84782012000400029
12. Madeira NR, Amaro GB, Melo RAC, Botrel N, Rochinski E. Cultivo de Ora-pro-nóbis (Pereskia) em Plantio Adensado sob Manejo de Colheitas Sucessivas. Circular Técnica 156. Embrapa Hortaliças; 2016. https://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1066888
13. Teixeira VMC, de Oliveira A, Backes E, et al. A critical appraisal of the most recent investigations on ora-pro-nobis (Pereskia sp.): economical, botanical, phytochemical, nutritional, and ethnopharmacological aspects. Plants (Basel). 2023;12(22):3874. doi:10.3390/plants12223874
14. Missouri Botanical Garden. Pereskia grandifolia. Plant Finder. Accessed October 13, 2026. https://www.missouribotanicalgarden.org/plantfinder/PlantFinderDetails.aspx?taxonid=369153
15. Brogren M, Savage GP. Bioavailability of soluble oxalate from spinach eaten with and without milk products. Asia Pac J Clin Nutr. 2003;12(2):219-224. https://pubmed.ncbi.nlm.nih.gov/12810415/
16. Tabela Brasileira de Composição de Alimentos (TBCA). Biodiversidade e alimentos regionais. Universidade de São Paulo, Food Research Center. Accessed October 13, 2026. https://www.tbca.net.br/base-dados/biodiversidade.php