# Lens nigricans (Black Lentil)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/lens-nigricans
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-31
**Evidence Score:** 2 / 10
**Category:** Legume
**Also Known As:** Lens culinaris var. nigricans, Black beluga lentils, Beluga lentils, Black gram lentils, Caviar lentils, Kala masoor, Black masoor dal, Petite black lentils

## Overview

Lens nigricans, or black lentil, is a wild legume species rich in polyphenols—including flavonoids and tannins—that contribute to measurable antioxidant activity via [free radical scaveng](/ingredients/condition/antioxidant)ing and ferric ion reduction. Its high protein profile, featuring leucine and lysine concentrations comparable to cultivated lentils, also supports its nutritional value as a dietary legume.

## Health Benefits

• [Antioxidant activity](/ingredients/condition/antioxidant): In vitro studies show DPPH radical scavenging (EC50 2.78-2.9 mg/mL) and ferric reducing antioxidant power (FRAP up to 46.04 µmol Fe²⁺/g DW) - preliminary evidence only
• High protein content: Contains essential amino acids including leucine (7.2 g/100g) and lysine (7.26 g/100g) - based on compositional analysis
• Phenolic compound richness: Total phenolic content up to 2434 µg/g DW, higher than other lentil varieties - in vitro evidence
• Anthocyanin content: Contains 0.042 mg/g DW anthocyanins (as delphinidin), highest among lentil varieties - laboratory analysis only
• Potential weight management support: Low fat, high protein profile used in weight-loss diet formulations - traditional use, no clinical trials

## Mechanism of Action

The polyphenolic compounds in Lens nigricans—primarily flavonoids and condensed tannins—donate hydrogen atoms to neutralize DPPH and hydroxyl free radicals, measured at an EC50 of 2.78–2.9 mg/mL in vitro. Ferric reducing capacity (FRAP up to 46.04 µmol Fe²⁺/g DW) reflects the ability of these phenolics to reduce Fe³⁺ to Fe²⁺ via electron transfer, inhibiting [lipid peroxidation](/ingredients/condition/antioxidant) chain reactions. Additionally, the high leucine content (7.2 g/100g protein) may activate mTORC1 signaling to stimulate muscle protein synthesis, though this mechanism has not been studied specifically in Lens nigricans.

## Clinical Summary

Research on Lens nigricans specifically is limited almost entirely to in vitro and compositional studies; no human randomized controlled trials have been conducted on this wild lentil species to date. [Antioxidant](/ingredients/condition/antioxidant) data derive from laboratory assays (DPPH and FRAP methods) measuring seed extracts, which do not confirm equivalent bioavailability or efficacy in vivo. Nutritional analyses document protein content with a favorable essential amino acid profile, but bioavailability studies comparing Lens nigricans to cultivated lentils (Lens culinaris) are absent. Extrapolation of benefits from broader lentil research is plausible but remains unvalidated for this specific species.

## Nutritional Profile

Lens nigricans (Black Lentil) is a nutrient-dense legume with the following documented compositional profile: PROTEIN: High protein content (~25-30 g/100g DW), containing all essential amino acids; notably leucine (7.2 g/100g protein) and lysine (7.26 g/100g protein), making it a relatively complete plant protein source with lysine levels favorable compared to cereal grains. CARBOHYDRATES: Predominantly complex carbohydrates with a significant dietary fiber fraction; resistant starch and oligosaccharides (raffinose-family) present, contributing to low glycemic index characteristics typical of lentil species. LIPIDS: Low fat content (~1-2 g/100g DW), typical of the Lens genus, with polyunsaturated fatty acids as the dominant lipid fraction. PHENOLIC COMPOUNDS: Total phenolic content (TPC) up to 2434 mg GAE/100g DW (among the higher values reported for wild lentil species), including condensed tannins, flavonoids (kaempferol and quercetin derivatives), and phenolic acids (ferulic, caffeic, p-coumaric acids); seed coat contributes disproportionately to phenolic load. [ANTIOXIDANT](/ingredients/condition/antioxidant) CAPACITY: DPPH radical scavenging EC50 of 2.78–2.9 mg/mL and FRAP up to 46.04 µmol Fe²⁺/g DW based on in vitro assays — in vivo bioavailability not yet established. MINERALS: Expected mineral profile consistent with Lens genus includes iron (~6-8 mg/100g DW), zinc (~3-4 mg/100g DW), magnesium, phosphorus, and potassium; exact values for L. nigricans remain incompletely characterized in published literature. VITAMINS: B-vitamin presence (B1 thiamine, B6, folate) is anticipated based on genus-level data; specific quantification for this species is limited in current literature. ANTINUTRITIONAL FACTORS: Phytic acid, tannins, and trypsin inhibitors are present and may reduce mineral bioavailability (particularly iron and zinc) in raw form; soaking, boiling, or fermentation is expected to reduce these significantly, as documented for related Lens species. BIOAVAILABILITY NOTE: High tannin and phytic acid levels in the seed coat may limit protein digestibility and mineral absorption in raw/unprocessed form; processing methods (cooking, dehulling, germination) are recommended to enhance nutrient bioavailability.

## Dosage & Preparation

No clinically studied dosages exist for black lentil extracts or standardized forms. In vitro studies used crude extracts at 2.78-6.32 mg/mL dry weight equivalent. Whole lentil flours are incorporated in foods at 10-30% for protein enrichment without established clinical dosing. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Lens nigricans contains tannins and phytic acid, antinutritional factors that can reduce iron and zinc bioavailability and may cause digestive discomfort, bloating, or gas—particularly when consumed raw or insufficiently cooked. Individuals with legume allergies or sensitivities to Fabaceae species should exercise caution, as cross-reactivity is possible. No specific drug interactions have been documented for Lens nigricans, though its phytic acid content could theoretically reduce absorption of oral iron supplements, zinc, and calcium if consumed simultaneously. Safety data in pregnancy and lactation are absent; standard dietary consumption is generally considered safe, but concentrated extracts should be avoided until evidence exists.

## Scientific Research

No human clinical trials, RCTs, or meta-analyses specifically on black lentil (Lens nigricans) were identified. Current evidence is limited to in vitro biochemical assays showing [antioxidant activity](/ingredients/condition/antioxidant) and compositional analyses of phenolic compounds, flavonoids, and nutritional components.

## Historical & Cultural Context

Lentils have been consumed for over 9,000 years in Near Eastern and Mediterranean diets as a staple protein source, featured in ancient Egyptian, Greek, and Ayurvedic systems. Black lentil varieties were used primarily for nutrition and sustenance rather than specific medicinal purposes.

## Synergistic Combinations

Other legumes, vitamin C sources, iron-rich foods, fiber supplements, plant-based proteins

## Frequently Asked Questions

### What is Lens nigricans and how does it differ from regular black lentils?

Lens nigricans is a wild lentil species distinct from the cultivated black lentil (often a variety of Lens culinaris such as Beluga). It grows natively in Mediterranean and Middle Eastern regions and has been studied primarily for its polyphenol content and antioxidant properties rather than as a commercial food crop. Its tannin and flavonoid levels may differ from cultivated varieties, though head-to-head nutritional comparisons remain limited.

### What is the antioxidant capacity of black lentil (Lens nigricans)?

In vitro studies report a DPPH radical scavenging EC50 of 2.78–2.9 mg/mL for Lens nigricans seed extracts, where a lower EC50 indicates stronger antioxidant potency. Its ferric reducing antioxidant power (FRAP) reaches up to 46.04 µmol Fe²⁺/g dry weight. These values are considered preliminary evidence only, as in vitro antioxidant assays do not directly predict activity in the human body.

### How much protein and what amino acids does Lens nigricans contain?

Lens nigricans is a high-protein legume containing notable concentrations of essential amino acids, including leucine at approximately 7.2 g/100g of protein and lysine at approximately 7.26 g/100g of protein. Lysine is a limiting amino acid in most cereal grains, making black lentil a complementary protein source in plant-based diets. However, bioavailability of this protein may be reduced by antinutritional factors like trypsin inhibitors and phytic acid unless seeds are properly soaked, sprouted, or cooked.

### Are there any side effects of eating Lens nigricans black lentils?

Consuming Lens nigricans may cause gastrointestinal side effects including bloating, flatulence, and abdominal cramping due to oligosaccharides (raffinose, stachyose) and tannins present in the seeds. The tannin and phytic acid content can also reduce absorption of minerals like iron, zinc, and calcium. Soaking seeds overnight and discarding the soaking water, followed by thorough cooking, significantly reduces these antinutritional factors and improves tolerability.

### Can Lens nigricans black lentil help with iron deficiency?

While lentils in general are a source of non-heme iron, Lens nigricans contains phytic acid and tannins that inhibit iron absorption—making it a potentially poor standalone strategy for correcting iron deficiency. Consuming it with vitamin C-rich foods can partially counteract this inhibition by converting Fe³⁺ to the more absorbable Fe²⁺ form. No clinical studies have specifically evaluated Lens nigricans for iron status improvement in humans, so individuals with diagnosed iron deficiency should not rely on it as a primary therapeutic source.

### How does the bioavailability of phenolic compounds in Lens nigricans compare to other legumes?

Lens nigricans contains up to 2434 mg/100g of total phenolic content, positioning it among phenol-rich legumes, though bioavailability depends on food preparation and individual gut microbiota. Cooking methods, particularly boiling, can reduce phenolic content by 20-40%, while fermentation may enhance bioavailability of these compounds. Direct comparisons with other legumes show variability, making dietary inclusion patterns more important than single-source reliance for consistent polyphenol intake.

### What is the recommended daily intake of Lens nigricans for general health maintenance?

There is no established RDA specifically for black lentils, but general legume consumption guidelines suggest 1/2 to 1 cup cooked lentils (approximately 100-200g) per day as part of a balanced diet to obtain meaningful levels of protein, fiber, and phenolic compounds. Individual needs vary based on dietary protein goals and overall nutritional status. Consultation with a healthcare provider is recommended for personalized dosing, particularly for those managing specific health conditions.

### What is the current strength of clinical evidence supporting health benefits of Lens nigricans?

Current evidence for Lens nigricans is primarily preliminary, based on in vitro studies demonstrating antioxidant capacity (DPPH scavenging and FRAP assays) rather than human clinical trials. Compositional data confirms high protein and amino acid content, but long-term efficacy studies in humans are limited. More rigorous randomized controlled trials are needed to establish definitive health claims beyond its established USDA nutrient-dense food status.

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