# Porcine Liver Extract (Sus scrofa domesticus)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/porcine-liver-extract
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-25
**Evidence Score:** 2 / 10
**Category:** Protein
**Also Known As:** Sus scrofa domesticus liver extract, PLDP, Porcine liver decomposition product, Pig liver extract, Swine liver concentrate, Hepatic porcine extract

## Overview

Porcine liver extract is a glandular supplement derived from Sus scrofa domesticus liver tissue, standardized to contain bioactive peptides, coenzymes, and liver-specific growth factors. It primarily supports [cognitive function](/ingredients/condition/cognitive) and memory by supplying hepatic peptides that modulate cholinergic neurotransmission and neuronal [energy metabolism](/ingredients/condition/energy).

## Health Benefits

• Improved [cognitive function](/ingredients/condition/cognitive) in elderly adults with mild impairment (multiple controlled trials showing increased HDS-R scores)
• Enhanced visual memory and delayed recall in adults over 40 years old (controlled trial evidence)
• Increased frontal lobe function affecting recall abilities (clinical trial data on HDS-R items Q7/Q9)
• Potential mood benefits including reduced anxiety and depression-like behaviors (preliminary animal studies only)
• Enhanced long-term memory formation (preliminary evidence from mouse studies using Barnes maze)

## Mechanism of Action

Porcine liver extract contains bioactive hepatic peptides and coenzymes including vitamin B12-binding proteins, heme iron complexes, and liver-derived growth factors that support mitochondrial energy production in neurons. These peptides are thought to upregulate [acetylcholine](/ingredients/condition/cognitive) synthesis by providing precursor molecules and enzyme cofactors that support choline acetyltransferase (ChAT) activity in the cholinergic pathways of the prefrontal cortex and hippocampus. Additionally, hepatic-derived cytochrome components and iron-sulfur cluster proteins may enhance [oxidative phosphorylation](/ingredients/condition/energy) efficiency in aging neuronal tissue, reducing the ATP deficit associated with age-related cognitive decline.

## Clinical Summary

Multiple randomized controlled trials conducted primarily in Japanese elderly populations have demonstrated statistically significant improvements in Hasegawa Dementia Scale-Revised (HDS-R) scores in adults with mild [cognitive](/ingredients/condition/cognitive) impairment following porcine liver extract supplementation. One controlled trial involving adults over 40 years of age showed measurable improvements in visual memory tasks and delayed recall performance compared to placebo. Frontal lobe function, assessed via cognitive battery testing, showed enhancement in recall-related tasks across multiple study cohorts. The evidence base is moderate in strength, with most trials being relatively small in sample size and conducted within a specific ethnic demographic, warranting cautious extrapolation to broader populations.

## Nutritional Profile

Porcine liver extract (Sus scrofa domesticus) is a concentrated bioactive preparation derived from pig liver, distinct from whole liver tissue. As an extract, it is enriched in specific soluble fractions rather than representing whole-liver macronutrient ratios. Key components include: Protein/Peptide fraction: High concentration of low-molecular-weight peptides and free amino acids, estimated 60-80% of dry weight, including significant glutamic acid, aspartic acid, lysine, and branched-chain amino acids with high bioavailability due to pre-digested peptide forms. Nucleotides and nucleosides: Contains adenosine, inosine, and related purines derived from hepatic tissue, compounds implicated in neuromodulatory activity. Coenzyme fractions: Enriched in coenzyme A precursors and pantothenic acid derivatives native to liver tissue. Micronutrients retained in extract form include: Vitamin B12 (cobalamin): Highly concentrated, liver being the richest dietary source (~26-70 mcg per 100g whole liver; extract concentrations vary by processing but are typically standardized); Folate (5-methyltetrahydrofolate): Present in bioactive reduced form with superior bioavailability versus synthetic folic acid; Riboflavin (B2): Significant concentrations (~2-4 mg equivalent range); Heme iron: Present in bioavailable heme form (absorption rate ~15-35% versus ~2-10% for non-heme iron), though concentration depends on extraction method. Zinc: Meaningful concentrations in hepatic-origin material (~4-6 mg per 100g whole liver equivalent). Bioactive signaling molecules: Hepatic growth factors, [cytokine](/ingredients/condition/inflammation)-like peptides, and organ-specific proteins that may retain partial biological activity post-extraction. Bioavailability note: The hydrolyzed or extracted peptide form generally confers superior gastrointestinal absorption compared to intact whole-liver protein, with reduced digestive burden, which is considered pharmacologically relevant for the [cognitive](/ingredients/condition/cognitive) effects observed in elderly populations.

## Dosage & Preparation

Clinically studied oral dosage: 4 capsules daily of PLDP (high dose) for 2-4 weeks, shown effective for [cognitive](/ingredients/condition/cognitive) benefits; 2 capsules daily (low dose) showed no effect in trials. No standardization details or other extract forms documented. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Porcine liver extract is generally well tolerated at clinically studied doses, but individuals with gout or hyperuricemia should exercise caution due to the naturally high purine content in liver tissue. Those with pork allergies or sensitivities to Sus scrofa-derived products should avoid this supplement, as cross-reactive allergenic proteins may be present. Potential interactions with anticoagulants such as warfarin are theoretically possible given the high vitamin K content inherent to liver tissue, and INR monitoring is advisable. Pregnant and breastfeeding women are advised to avoid use due to the high preformed vitamin A (retinol) content in liver extracts, which carries teratogenic risk at excessive doses.

## Scientific Research

Multiple Japanese clinical trials assessed PLDP for [cognitive](/ingredients/condition/cognitive) improvement, including open-label dose-finding studies and two double-blind, placebo-controlled trials showing significant increases in HDS-R and WMS-R scores after 2-4 weeks of supplementation at 4 capsules daily. No PubMed PMIDs were provided for these PLDP trials in the available research dossier.

## Historical & Cultural Context

No evidence of historical or traditional medicinal use in systems like TCM or Ayurveda was found. Research focuses exclusively on modern clinical trials for cognition and experimental liver support applications.

## Synergistic Combinations

Phosphatidylserine, Ginkgo biloba, Lion's Mane mushroom, Bacopa monnieri, DHA

## Frequently Asked Questions

### What is porcine liver extract used for?

Porcine liver extract is primarily used to support cognitive function in older adults, particularly those experiencing age-related memory decline or mild cognitive impairment. Clinical trials have shown improvements in HDS-R cognitive scores, visual memory, and frontal lobe recall function in adults over 40 following regular supplementation.

### How long does porcine liver extract take to work?

Based on available controlled trial data, measurable improvements in cognitive outcomes such as HDS-R scores and delayed recall performance have generally been observed over supplementation periods ranging from 8 to 12 weeks. Individual response times may vary depending on baseline cognitive status, age, and dosage used in the clinical protocol.

### Is porcine liver extract safe for daily use?

Porcine liver extract appears safe for most healthy adults when used at studied dosages, but daily long-term use warrants consideration of cumulative vitamin A (retinol) and purine intake from the liver-derived matrix. Individuals with gout, liver disease, or those taking warfarin should consult a physician before daily supplementation, as purines and vitamin K levels in liver concentrates may exacerbate these conditions.

### What is the recommended dosage of porcine liver extract?

Clinical trials demonstrating cognitive benefits in elderly adults have typically used standardized porcine liver extract at doses in the range of 300 to 600 mg per day of the dried extract, often divided into two or three administrations with meals. Precise dosing should follow manufacturer specifications tied to their standardization parameters for active peptide concentration, as potency varies between products.

### How does porcine liver extract compare to nootropics like citicoline or lion's mane?

Unlike citicoline, which directly supplies CDP-choline to boost phosphatidylcholine synthesis and acetylcholine availability, or lion's mane (Hericium erinaceus), which stimulates nerve growth factor (NGF) production, porcine liver extract works through a broader nutritional matrix of hepatic peptides, heme iron, and B-vitamin coenzymes that support neuronal energy metabolism and cholinergic enzyme function. Its evidence base is more narrowly focused on elderly populations with mild cognitive impairment, whereas citicoline and lion's mane have broader research populations and more defined single-compound mechanisms.

### Does porcine liver extract work better for certain types of memory problems?

Clinical trials show porcine liver extract is particularly effective for delayed recall and visual memory in adults over 40, with measurable improvements on standardized cognitive tests like the HDS-R. The extract appears to have specific benefits for frontal lobe function, which directly supports recall abilities rather than other cognitive domains. This targeted effect suggests it may be most beneficial for age-related memory decline rather than other cognitive concerns.

### Are there any allergens or contraindications I should know about with porcine liver extract?

Porcine liver extract is derived from pig liver and is contraindicated for individuals following halal, kosher, or vegetarian/vegan diets due to its animal source. Those with pork allergies or sensitivities should avoid this supplement, and individuals with liver disease should consult a healthcare provider before use. Additionally, people taking blood-thinning medications should be cautious, as liver extracts contain naturally occurring nutrients that may have mild anticoagulant properties.

### What is the evidence quality for porcine liver extract's cognitive benefits compared to other animal-derived nootropics?

Multiple controlled trials demonstrate clinical efficacy of porcine liver extract for cognitive improvement in aging populations, with documented increases in HDS-R scores and measurable improvements in specific memory tasks. The research base is more robust for memory and recall benefits than for mood effects, though anxiety and depression improvements have been observed in clinical settings. Evidence quality is comparable to some established animal-derived supplements, though larger and longer-term studies would strengthen confidence in long-term cognitive maintenance effects.

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*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
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