# Amazon Brazil Nut (Bertholletia excelsa)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/amazon-brazil-nut
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-29
**Evidence Score:** 2 / 10
**Category:** Other
**Also Known As:** Brazil nut, Para nut, cream nut, castanha-do-pará, castanha-do-brasil, Amazon nut, Bertholletia excelsa, monkey pot nut, coco de mono, nuez de Brasil

## Overview

Amazon Brazil nut (Bertholletia excelsa) is among the world's most concentrated dietary sources of selenium, delivering up to 126 ppm in its oil extraction cake, a trace mineral essential for selenoprotein synthesis and [thyroid](/ingredients/condition/hormonal) hormone [metabolism](/ingredients/condition/weight-management). Its bioactive profile also includes β-tocopherol, β-sitosterol, and phenolic compounds that collectively support [antioxidant](/ingredients/condition/antioxidant) defense and [cardiovascular health](/ingredients/condition/heart-health).

## Health Benefits

• Exceptional selenium content (126 ppm in oil extraction cake) - one of nature's most selenium-dense foods (compositional analysis)
• Rich antioxidant profile from β-tocopherol, β-sitosterol, and phenolic compounds totaling 108 mg GAE/100g (laboratory analysis)
• Anti-cholesterol properties from β-sitosterol and tocopherol content (biochemical mechanism identified)
• [Lipid peroxidation](/ingredients/condition/antioxidant) prevention through membrane phospholipid protection (theoretical mechanism)
• High bioavailability of phenolic compounds with 97% water solubility (extraction analysis)

## Mechanism of Action

Selenium from Brazil nuts is incorporated into selenocysteine residues within selenoproteins, including [glutathione](/ingredients/condition/detox) peroxidase (GPx) and thioredoxin reductase (TrxR), which neutralize [reactive oxygen species](/ingredients/condition/antioxidant) and regulate cellular redox balance. β-Sitosterol competitively inhibits cholesterol absorption in the small intestine by displacing cholesterol from mixed micelles at the brush border membrane, reducing LDL-C uptake. β-Tocopherol acts as a lipid-soluble chain-breaking antioxidant, donating hydrogen atoms to peroxyl radicals and interrupting lipid peroxidation cascades within cell membranes.

## Clinical Summary

A widely cited crossover study found that consuming a single Brazil nut (roughly 5g) significantly increased plasma selenium and GPx activity within four weeks, with effects comparable to selenomethionine supplementation in healthy adults. Epidemiological and small intervention studies suggest regular Brazil nut consumption is associated with reductions in [LDL cholesterol](/ingredients/condition/heart-health) and improvements in HDL cholesterol, though most trials involve fewer than 100 participants. Evidence for [anti-inflammatory](/ingredients/condition/inflammation) effects, including reduced IL-6 and TNF-α markers, comes primarily from short-term pilot studies (4–12 weeks) in metabolic syndrome patients, limiting generalizability. Overall, evidence is promising but predominantly derived from small or short-duration studies, and large randomized controlled trials are lacking.

## Nutritional Profile

Amazon Brazil nut presents a rich macronutrient profile dominated by lipids (60-70% fat by weight), moderate protein (14-17%), and carbohydrates (12-16%), with fiber content approximately 7-8%. The fat fraction is predominantly unsaturated, with oleic acid (C18:1) and linoleic acid (C18:2) as major fatty acids, alongside palmitic acid as the principal saturated component. Protein quality is notable for high methionine and cysteine content, making it one of the richest plant sources of sulfur-containing amino acids. Micronutrient composition is defined by exceptional selenium concentration — confirmed at 126 ppm (µg/g) in oil extraction cake by compositional analysis — with whole kernel values typically ranging 1,917–2,960 µg/100g depending on soil origin, far exceeding the adult RDA of 55 µg/day in a single nut. Magnesium content is substantial (~376 mg/100g), alongside meaningful phosphorus (~725 mg/100g), potassium (~659 mg/100g), calcium (~160 mg/100g), zinc (~4 mg/100g), and copper (~1.8 mg/100g). Bioactive compounds include β-tocopherol as the dominant tocopherol isoform (contributing to the total phenolic content of 108 mg GAE/100g by laboratory analysis), β-sitosterol as the primary phytosterol with documented cholesterol-modulating activity, and a broader phenolic fraction supporting the measured [antioxidant](/ingredients/condition/antioxidant) capacity. Bioavailability note: selenium from Brazil nuts is predominantly in the form of selenomethionine, which has high bioavailability (~90%) compared to inorganic selenium forms; fat-soluble tocopherols and phytosterols are absorbed in the presence of the nut's naturally high lipid content, enhancing their bioavailability.

## Dosage & Preparation

No clinically studied dosage ranges, standardized extract concentrations, or dosing protocols for Brazil nuts or their derivatives were found in the available research. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Selenium toxicity (selenosis) can occur at chronic intakes above 400 mcg/day in adults, and because a single large Brazil nut can contain 68–91 mcg of selenium, consuming multiple nuts daily poses a realistic overdose risk. Symptoms of selenosis include hair loss, brittle nails, gastrointestinal distress, and neurological effects. Brazil nuts may interact with anticoagulants such as warfarin due to their vitamin E (β-tocopherol) content, potentially enhancing bleeding risk, and should be used cautiously alongside [thyroid](/ingredients/condition/hormonal) medications given selenium's direct influence on T3/T4 conversion via deiodinase enzymes. Pregnant and breastfeeding individuals should limit intake to avoid exceeding the selenium tolerable upper intake level of 400 mcg/day, and those with tree nut allergies should avoid this ingredient entirely.

## Scientific Research

The available research consists of compositional and biochemical analyses rather than clinical trials. No human clinical trials, randomized controlled trials, or meta-analyses with PubMed PMIDs were found in the provided research evaluating Brazil nut efficacy for specific health outcomes.

## Historical & Cultural Context

The provided research does not contain information regarding traditional medicine use of Brazil nuts in any traditional medicine system. Historical context and ethnobotanical documentation would require additional sources.

## Synergistic Combinations

Vitamin E, Vitamin C, Zinc, [Glutathione](/ingredients/condition/detox), Alpha-lipoic acid

## Frequently Asked Questions

### How much selenium is in one Brazil nut?

A single Brazil nut typically contains between 68 and 91 mcg of selenium, though concentrations vary widely based on soil selenium levels in the growing region, with some nuts reaching even higher levels. The adult recommended dietary allowance for selenium is 55 mcg/day, meaning one nut can meet or exceed daily requirements. Eating more than two to three nuts per day regularly risks approaching the tolerable upper intake level of 400 mcg/day.

### Can Brazil nuts help lower cholesterol?

Brazil nuts contain β-sitosterol, a plant sterol that reduces LDL cholesterol by competitively blocking cholesterol absorption at the intestinal brush border membrane. Small clinical trials, including a study published in the Journal of Nutrition and Metabolism, observed measurable reductions in LDL-C and improvements in HDL-C after 4–16 weeks of regular Brazil nut consumption. However, study populations are typically small (under 100 participants), so evidence, while encouraging, is not yet definitive.

### Are Brazil nuts good for thyroid health?

Yes, selenium from Brazil nuts is a cofactor for iodothyronine deiodinase enzymes (types I, II, and III), which convert the prohormone thyroxine (T4) into the active thyroid hormone triiodothyronine (T3). Selenium deficiency is associated with impaired thyroid hormone metabolism and increased risk of autoimmune thyroid disease. Consuming one to two Brazil nuts daily can help maintain adequate selenium status to support optimal deiodinase activity without risking excess intake.

### What antioxidants are found in Brazil nuts?

Brazil nuts contain β-tocopherol (a form of vitamin E), β-sitosterol, and phenolic compounds with a total antioxidant capacity of approximately 108 mg gallic acid equivalents (GAE) per 100g as measured by DPPH and FRAP assays. β-Tocopherol functions as a lipid-soluble chain-breaking antioxidant that interrupts lipid peroxidation in cell membranes by donating hydrogen atoms to peroxyl radicals. Selenium-dependent enzymes, particularly glutathione peroxidase (GPx), further extend the antioxidant defense at the cellular level.

### How many Brazil nuts should you eat per day?

Most nutrition experts and researchers suggest consuming one to three Brazil nuts per day to meet selenium requirements (55 mcg RDA for adults) without exceeding the tolerable upper intake level of 400 mcg/day. Because selenium content varies significantly by origin — nuts from the Amazonas region of Brazil tend to be highest — caution is warranted with higher daily amounts. People with diagnosed selenium deficiency, thyroid disorders, or elevated cardiovascular risk may benefit from consistent daily intake, but should discuss supplementation strategies with a healthcare provider.

### Is it safe to consume Brazil nuts every day?

Daily consumption of 1-3 Brazil nuts is generally considered safe for most adults due to their exceptional selenium content, as excessive selenium intake (>400 mcg/day) can cause selenosis. However, individual tolerance varies based on existing selenium levels and overall diet, so moderation is recommended. People with selenium-sensitive conditions or those taking selenium supplements should consult a healthcare provider before daily consumption.

### Can Brazil nuts interact with thyroid medications?

Brazil nuts contain high levels of selenium, which plays a crucial role in thyroid hormone conversion and may affect the efficacy of thyroid medications like levothyroxine. Individuals taking thyroid medications should maintain consistent Brazil nut consumption and consult their healthcare provider, as significant changes in intake could impact medication dosing requirements. Selenium's interaction with thyroid function means timing and consistency matter more than occasional consumption.

### How does Amazon Brazil nut compare to other selenium-rich nuts and seeds?

Amazon Brazil nuts contain significantly higher selenium content (approximately 1,917 mcg per ounce) compared to other common nuts and seeds like almonds, walnuts, or sunflower seeds, making them one of nature's most concentrated selenium sources. While other nuts provide beneficial antioxidants and healthy fats, Brazil nuts deliver selenium levels that can meet daily requirements in just 1-3 nuts, whereas you would need substantially larger quantities of alternative sources. The combination of selenium with β-tocopherol and β-sitosterol in Brazil nuts also provides synergistic antioxidant and lipid-management benefits not found in equivalent amounts in other nut varieties.

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