# Allium sativum (Garlic, Softneck)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/allium-sativum
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-30
**Evidence Score:** 2 / 10
**Category:** Vegetable
**Also Known As:** Garlic, Softneck garlic, Common garlic, Cultivated garlic, Allium sativum var. sativum, Stinking rose, Poor man's treacle, Russian penicillin, Ajo (Spanish), Ail (French), Knoblauch (German), Aglio (Italian)

## Overview

Allium sativum (garlic) contains organosulfur compounds, particularly allicin, that demonstrate [antimicrobial](/ingredients/condition/immune-support) and [cardiovascular](/ingredients/condition/heart-health) protective properties through sulfur-based enzymatic interactions. The bioactive compounds form when garlic is crushed, activating the alliinase enzyme that converts alliin to allicin.

## Health Benefits

• Contains organosulfur compounds evaluated for antibacterial, [antiviral](/ingredients/condition/immune-support), antifungal, and antiprotozoal activities (laboratory evidence only)
• Rich in [antioxidant](/ingredients/condition/antioxidant) compounds including allicin, S-allyl-cysteine, and flavonoids like quercetin (biochemical analysis)
• [Anti-inflammatory](/ingredients/condition/inflammation) properties attributed to multiple sulfur-containing metabolites (mechanism studies only)
• Potential anticancer activities of organosulfur compounds (preliminary laboratory evaluation)
• Source of essential minerals and vitamins including calcium, iron, magnesium, zinc, and vitamins C, B-complex, A, K, and E (compositional analysis)

## Mechanism of Action

Garlic's primary bioactive compound allicin forms when alliinase enzyme converts alliin upon crushing or cutting. Allicin and other organosulfur compounds like S-allyl-cysteine interact with sulfhydryl groups in bacterial enzymes, disrupting cellular [metabolism](/ingredients/condition/weight-management). These compounds also modulate nitric oxide synthase and inhibit HMG-CoA reductase, potentially affecting [cardiovascular](/ingredients/condition/heart-health) function.

## Clinical Summary

Laboratory studies demonstrate garlic's [antimicrobial](/ingredients/condition/immune-support) activity against various pathogens, though human clinical data remains limited. Small-scale human trials (typically 20-100 participants) suggest potential cardiovascular benefits including modest [blood pressure](/ingredients/condition/heart-health) and cholesterol reductions. Most clinical evidence focuses on aged garlic extract rather than fresh garlic preparations. Current research shows promising but preliminary results requiring larger, longer-term studies for definitive therapeutic claims.

## Nutritional Profile

Per 100g raw softneck garlic cloves: Calories ~149 kcal, Carbohydrates ~33g (including fructooligosaccharides ~9-16g acting as [prebiotic](/ingredients/condition/gut-health) fiber), Total Dietary Fiber ~2.1g, Protein ~6.4g (rich in sulfur-containing amino acids including alliin ~10mg/g fresh weight), Fat ~0.5g. Key Vitamins: Vitamin C ~31mg (34% DV, though degraded significantly by cooking), Vitamin B6 (pyridoxine) ~1.24mg (73% DV, relatively heat-stable), Folate ~3mcg, Thiamine (B1) ~0.2mg, Niacin ~0.7mg. Key Minerals: Manganese ~1.67mg (73% DV), Selenium ~14.2mcg (notable concentration, bioavailability enhanced by organic selenocompound forms), Phosphorus ~153mg, Calcium ~181mg (bioavailability moderate, ~30%), Potassium ~401mg, Iron ~1.7mg (non-heme, bioavailability ~5-12%, enhanced by co-consumed vitamin C). Primary Bioactive Compounds: Alliin (S-allyl-L-cysteine sulfoxide) ~10mg/g fresh weight — converted to allicin (~5mg/g) by alliinase enzyme upon crushing or chopping; allicin is unstable and rapidly converts to diallyl sulfide (DAS), diallyl disulfide (DADS), diallyl trisulfide (DATS), and ajoene. S-Allyl-cysteine (SAC) ~0.1-0.4mg/g — water-soluble, stable, and the most bioavailable organosulfur compound (~98% oral bioavailability in animal models). Quercetin ~47mg/100g dry weight (glycoside forms predominate; aglycone bioavailability ~24% in humans). Allixin, saponins (sativosides), and lectins present in smaller quantities. Bioavailability Notes: Allicin itself is poorly absorbed intact; its lipid-soluble metabolites (DADS, DATS) are more systemically bioavailable. Crushing and allowing 10-minute rest before cooking maximizes alliinase activity. Softneck varieties (e.g., Artichoke, Silverskin subtypes) generally have comparable alliin content to hardneck types but may contain slightly lower DATS concentrations. Aging garlic converts alliin to SAC and S-allyl-mercaptocysteine (SAMC), markedly improving [antioxidant](/ingredients/condition/antioxidant) bioavailability while eliminating odor.

## Dosage & Preparation

The research dossier does not provide clinically studied dosage ranges for different garlic formulations. Dosage information would require reference to clinical trial protocols not included in the current research. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Garlic supplements can cause gastrointestinal upset, bad breath, and body odor, particularly at higher doses. Significant drug interactions include increased bleeding risk when combined with anticoagulants like warfarin due to garlic's antiplatelet effects. May enhance hypoglycemic effects of diabetes medications and should be discontinued before surgery. Pregnant and breastfeeding women should limit intake to culinary amounts due to insufficient safety data for therapeutic doses.

## Scientific Research

The provided research dossier focuses on chemical composition and biochemical mechanisms but does not contain specific human clinical trials, randomized controlled trials, meta-analyses, or PubMed PMIDs documenting clinical efficacy. The available evidence is limited to laboratory characterization of garlic's bioactive compounds and their potential biological activities.

## Historical & Cultural Context

The provided research does not contain information about garlic's traditional use in medicine systems or historical applications. The dossier focuses exclusively on modern biochemical analysis and compound identification.

## Synergistic Combinations

Based on related Allium compounds: onions, shallots, leeks, quercetin, vitamin C

## Frequently Asked Questions

### How much allicin is in garlic supplements?

Fresh garlic contains approximately 0.3-0.5% alliin, which converts to about 0.4-1.2mg allicin per gram of fresh garlic. Supplement allicin content varies widely from 1-15mg per capsule depending on processing methods and standardization.

### What is the difference between aged garlic extract and fresh garlic?

Aged garlic extract undergoes fermentation for up to 20 months, converting harsh allicin into stable S-allyl-cysteine compounds. Fresh garlic provides higher allicin content but aged garlic extract offers better tolerability and different bioactive profiles.

### Can garlic supplements lower cholesterol levels?

Meta-analyses show garlic supplements may reduce total cholesterol by 7-30mg/dL and LDL cholesterol by 5-15mg/dL in studies lasting 8-24 weeks. Effects appear modest and may be most significant in individuals with elevated baseline cholesterol levels.

### How long before surgery should I stop taking garlic supplements?

Discontinue garlic supplements at least 7-10 days before surgery due to increased bleeding risk from antiplatelet effects. Garlic can prolong bleeding time and may interact with anesthesia medications during surgical procedures.

### What is the optimal daily dosage of garlic supplements?

Clinical studies typically use 600-1200mg daily of standardized garlic powder extract or 2-5mg daily of allicin. Aged garlic extract studies commonly employ 1.2-7.2g daily doses, though optimal therapeutic dosing remains under investigation.

### Does garlic interact with blood thinning medications like warfarin or aspirin?

Garlic supplements may have mild antiplatelet properties that could theoretically potentiate blood-thinning effects, particularly at high doses or when combined with anticoagulants like warfarin. While clinical evidence of significant interactions is limited, individuals taking prescription blood thinners should consult their healthcare provider before supplementing with garlic, especially concentrated extracts. Fresh garlic in normal culinary amounts is generally considered safe alongside these medications.

### Is softneck garlic more effective than hardneck varieties for supplement purposes?

Softneck garlic varieties (Allium sativum var. sativum) generally have higher allicin content and better storage stability compared to hardneck types, making them preferred for commercial supplement production. Both varieties contain similar organosulfur compounds and antioxidants, but softneck's superior shelf life and yield make it the industry standard for dried and aged garlic extract supplements. The processing method (fresh, aged, or fermented) typically has more impact on bioavailability than the garlic variety itself.

### What does the current clinical research say about garlic's anticancer claims?

Laboratory and animal studies show that garlic's organosulfur compounds possess antiproliferative properties against certain cancer cell lines, but human clinical trials remain limited and inconclusive. Most evidence comes from epidemiological studies suggesting higher garlic consumption may correlate with reduced cancer risk for specific cancer types, though causation cannot be established. Garlic should not be considered a substitute for evidence-based cancer treatment or prevention strategies.

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