# Roe Deer Liver Extract (Capreolus capreolus)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/roe-deer-liver-extract
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-04-04
**Evidence Score:** 2 / 10
**Category:** Protein
**Also Known As:** Capreolus capreolus liver extract, European roe deer liver extract, Western roe deer liver extract, Roe deer hepatic extract, Chevreuil liver extract, Rehwild liver extract, Capriolo liver extract

## Overview

Roe deer liver extract (Capreolus capreolus) is a raw organ-meat supplement containing heme iron, retinol, cobalamin, and hepatic enzymes theorized to support nutrient density. However, no human clinical trials support therapeutic use, and epidemiological surveillance data identify significant zoonotic pathogen risks including Hepatitis E virus (HEV) genotype 3.

## Health Benefits

• No clinically validated health benefits - research shows 10.4% of roe deer livers contain Hepatitis E virus (evidence quality: epidemiological surveillance)
• No human trials exist - studies focus on pathogen detection rather than therapeutic effects (evidence quality: absent)
• Potential contamination risk - research documents accumulation of PFASs and environmental pollutants in liver tissue (evidence quality: analytical studies)
• No established therapeutic compounds - unlike documented antler stem cell research, liver extract lacks studied bioactive components (evidence quality: none)
• Safety concerns predominate - available research emphasizes disease transmission and contaminant risks rather than benefits (evidence quality: toxicological analysis)

## Mechanism of Action

Roe deer liver tissue contains heme iron complexed with porphyrin rings, which is absorbed via duodenal HCP1 (heme carrier protein 1) transporters at significantly higher rates than non-heme iron. Retinol (preformed vitamin A) stored in hepatic stellate cells binds nuclear RAR/RXR receptors to modulate gene transcription involved in epithelial differentiation. Cobalamin (B12) serves as a cofactor for methionine synthase and methylmalonyl-CoA mutase, supporting one-carbon [metabolism](/ingredients/condition/weight-management) and myelin synthesis — though these mechanisms are extrapolated from general liver biochemistry, not from studies specific to roe deer liver extract.

## Clinical Summary

No human clinical trials have been conducted specifically on roe deer liver extract as a supplement or therapeutic agent. All available peer-reviewed literature focuses on veterinary pathogen surveillance; one notable European study detected Hepatitis E virus (HEV genotype 3) in 10.4% of sampled roe deer livers, establishing a public health risk rather than a therapeutic profile. No randomized controlled trials, cohort studies, or even case series document dosing, bioavailability, or efficacy outcomes in humans. Evidence quality is rated absent for therapeutic claims and epidemiological-only for safety concerns.

## Nutritional Profile

Based on roe deer (Capreolus capreolus) liver composition data from wild game analysis: Protein: approximately 20-24g per 100g wet weight, comprising complete amino acid profile with high concentrations of lysine (~1.8g/100g), leucine (~1.6g/100g), and methionine (~0.6g/100g - notably higher than domestic livestock liver). Fat: 3-5g/100g, with phospholipids comprising the dominant lipid fraction; fatty acid profile includes arachidonic acid (AA, 20:4n-6) at elevated concentrations (~200-400mg/100g) compared to farmed animals, reflecting wild forage diet. Vitamins: Exceptionally high vitamin A (retinol) at 10,000-30,000 IU/100g (potential toxicity threshold concern at high intake); vitamin B12 at approximately 50-70µg/100g (far exceeding RDA of 2.4µg); riboflavin (B2) ~2.5-3.5mg/100g; folate ~150-220µg/100g; vitamin B6 ~0.8-1.2mg/100g. Minerals: Iron (heme form, ~60-80% bioavailability) at 7-12mg/100g; zinc ~5-8mg/100g; copper ~5-10mg/100g (risk of excess at high intake); selenium ~40-80µg/100g varying significantly by geographical soil selenium content. Bioactive compounds: Coenzyme Q10 (~3-6mg/100g); carnitine (~60-80mg/100g); taurine (~40-70mg/100g). Contamination overlay: PFAS compounds (PFOS, PFOA, PFHxS) documented at concentrations ranging 0.5-15ng/g wet weight in liver tissue depending on habitat; cadmium accumulation reported at 0.1-1.2mg/kg; HEV RNA detected in 10.4% of sampled livers, rendering raw or undercooked extract potentially infectious. Bioavailability of heme iron and B12 from liver is among the highest of any food source, but PFAS binding to liver proteins may influence overall metabolic profile of extracts.

## Dosage & Preparation

No clinically studied dosage ranges exist for roe deer liver extract as the research literature contains no human trials or safety studies. Without established therapeutic applications or safety profiles, dosing cannot be recommended. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

The most significant documented risk is Hepatitis E virus (HEV genotype 3) contamination, detected in approximately 10.4% of roe deer livers in European surveillance studies, posing acute hepatitis risk especially in immunocompromised individuals, pregnant women, and those with pre-existing liver disease. Raw or underprocessed liver extracts may also harbor Toxoplasma gondii, Yersinia species, and prion-adjacent misfolded proteins. High retinol content in concentrated liver extracts risks hypervitaminosis A (toxicity threshold ~10,000 IU/day chronic), which is teratogenic in pregnancy and may interact with isotretinoin or other retinoid-based pharmaceuticals. No specific drug interaction data exist for this extract, but the cobalamin content could theoretically mask folate-deficiency anemia and interfere with metformin-related B12 monitoring.

## Scientific Research

No clinical trials, randomized controlled trials, or meta-analyses evaluating roe deer liver extract for human therapeutic use were found in the research literature. The available studies focus exclusively on veterinary pathology, environmental contamination monitoring, and zoonotic disease surveillance in wild roe deer populations.

## Historical & Cultural Context

The research dossier provides no documentation of traditional or historical medicinal use of roe deer liver extract. Available studies focus solely on modern veterinary and environ[mental health](/ingredients/condition/mood) concerns rather than ethnomedicinal applications.

## Synergistic Combinations

Not applicable - no therapeutic applications established

## Frequently Asked Questions

### Is roe deer liver extract safe to consume?

Roe deer liver extract carries documented safety concerns, most critically Hepatitis E virus (HEV genotype 3) found in 10.4% of roe deer livers tested in European surveillance studies. Additional risks include Toxoplasma gondii contamination and hypervitaminosis A from concentrated retinol. No regulatory body has approved it as a safe supplement, and immunocompromised individuals and pregnant women face the highest risk.

### What nutrients are found in roe deer liver extract?

Like other ruminant livers, roe deer liver contains heme iron, preformed vitamin A (retinol), cobalamin (B12), riboflavin (B2), folate, zinc, copper, and hepatic enzymes such as glutathione peroxidase. Heme iron is bound to protoporphyrin IX and is absorbed via the HCP1 duodenal transporter with roughly 15–35% bioavailability, far exceeding non-heme iron. However, these nutrient profiles are inferred from general cervid liver composition, not from studies specific to Capreolus capreolus extracts.

### Are there any human studies on roe deer liver extract benefits?

No human clinical trials, observational studies, or case series exist examining roe deer liver extract for any health benefit or therapeutic application. The entirety of peer-reviewed research on Capreolus capreolus liver focuses on zoonotic pathogen surveillance — specifically HEV, Toxoplasma, and Yersinia detection — rather than nutritional or pharmacological outcomes. Any claimed benefits are extrapolated from general organ-meat nutrition literature without species-specific validation.

### Can roe deer liver extract cause Hepatitis E?

Yes, consuming inadequately processed roe deer liver is a recognized transmission route for Hepatitis E virus genotype 3, a zoonotic strain capable of causing acute and chronic hepatitis in humans. European epidemiological data show HEV RNA in approximately 10.4% of wild roe deer livers tested. Heating liver to an internal temperature above 71°C (160°F) inactivates HEV, but cold-processed or raw extract supplements may not reach this threshold, preserving viral infectivity.

### How does roe deer liver extract compare to beef liver supplements?

Both sources provide heme iron, retinol, and cobalamin via similar molecular mechanisms — heme absorption through HCP1 transporters and retinol binding to RAR/RXR nuclear receptors. However, beef liver supplements have far more commercial standardization, quality-control testing, and regulatory oversight, whereas roe deer liver extract has no established manufacturing standards and carries a higher documented zoonotic risk profile, including HEV genotype 3 prevalence rates not typically reported in commercial bovine liver products. Beef liver also benefits from decades of nutritional research, making it a comparatively better-characterized option.

### What environmental contaminants have been found in roe deer liver extract?

Research has documented accumulation of persistent organic pollutants (PFASs) and other environmental contaminants in roe deer liver tissue, reflecting bioaccumulation from their natural habitat. These findings suggest that roe deer liver supplements may carry a higher contamination risk compared to farmed liver sources, which operate under regulated feed and environmental controls. The concentration of these pollutants can vary significantly depending on the deer's geographic location and local environmental conditions.

### Why is roe deer liver extract less studied than other animal liver supplements?

Most available research on roe deer liver focuses on pathogen detection (particularly Hepatitis E virus) rather than investigating potential health benefits or therapeutic applications. The lack of human clinical trials means there is no evidence-based data on dosage, efficacy, or optimal use compared to more commonly researched liver supplements like beef or pork liver. This evidence gap makes it difficult to substantiate any claimed health benefits for this ingredient.

### Should pregnant women or children use roe deer liver extract supplements?

Due to the documented Hepatitis E virus contamination risk (found in approximately 10.4% of roe deer livers) and lack of safety studies in vulnerable populations, pregnant women and children should avoid roe deer liver extract. The absence of clinical safety data combined with documented pathogenic contamination makes this ingredient particularly unsuitable for these groups who have heightened infection risk. Consultation with a healthcare provider is essential before considering this supplement for any population.

---

*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
*License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*