Garlic Allium sativum Tincture - Information Page

Garlic – Allium sativum L.

Overview

Garlic has been used for thousands of years as one of the oldest cultivated medicinal plants. Known for its distinctive aroma and potent bioactive compounds, it is valued in traditional or herbal medicine for its wide range of therapeutic properties including cardiovascular, antimicrobial, immunostimulant, and liver-protective benefits.

Plant Profile
Attribute Details
Common name Garlic
Latin denomination Allium sativum L.
Botanical family Amaryllidaceae (formerly Alliaceae, Liliaceae)
Description Perennial bulbous plant, up to 50 cm tall. Bulb made up of cloves. Flat leaves, sterile flowers in umbels.
Habitat Native to Central Asia, naturalized in Southern Europe, cultivated worldwide in temperate regions.
Traditional status Known as the “Theriac of peasants” (Galen). Sacred in ancient Egypt, rationed to pyramid workers for strength and protection against epidemics. Widely used in Chinese longevity traditions.

Parts Used
  • Fresh or dried bulb (garlic clove or powder)
  • Essential oil (distilled from fresh clove)
  • Tinctures, mists, aged garlic preparations
Composition
Compound Class Main Components
Carbohydrates Fructans (up to 75%), inulin, polysaccharides
Sulfur compounds Alliin, allicin, ajoene, diallyl sulfide (DAS), diallyl disulfide (DADS), diallyl trisulfide (DATS)
Amino acid derivatives S-allylmercaptocysteine, S-allylcysteine (especially in aged garlic)
Phenolics & flavonoids Antioxidant compounds
Trace minerals Rich in selenium and germanium
Essential oil compounds Diallyl sulfide, disulfide (≈60%), trisulfide (≈20%)

Properties and Possible Benefits
Property Reported Effects
Antimicrobial Bactericidal, fungicidal, antiviral, antiparasitic
Antioxidant Neutralizes free radicals; free radical scavenger
Antidiabetic May reduce blood glucose and protein glycation
Hepatoprotective Protective against toxin-induced liver damage
Cardiovascular Lowers blood pressure, reduces cholesterol, prevents platelet aggregation
Immunostimulant Enhances macrophages, NK cells, T/B cell activity
Neuroprotective Possible protective action against Alzheimer’s and neurotoxicity
Anti-cancer Organosulfur compounds may inhibit tumor cell growth and enhance detoxification enzymes
Anti-inflammatory Reduces inflammatory responses and modulates immune system
Expectorant Helpful in respiratory infections and congestion

Scientific Evidence Highlights
  • Blood Pressure: A meta-analysis of 20 clinical trials (970 participants, 2016) confirmed reductions in systolic (-5.1 mmHg) and diastolic (-2.5 mmHg) blood pressure versus placebo. Comparable to atenolol in some studies.
  • Cholesterol: Reduces total cholesterol and LDL after 2+ months of supplementation. Aged garlic extract improves HDL levels and may slow coronary calcification.
  • Immunity: Clinical studies show garlic reduces frequency and severity of upper respiratory tract infections.
  • Antimicrobial: Active against bacteria (e.g., Campylobacter), fungi (e.g., Candida), parasites, and may act as a foodborne pathogen inhibitor.
  • Cancer Prevention: Organosulfur compounds (diallyl disulfides, S-allylmercaptocysteine) show protective action against stomach, colorectal, liver, breast, and prostate cancers.
Indications
Indication Area Use in Phytotherapy & Aromatherapy
Cardiovascular support Hypertension, cholesterol regulation, arteriosclerosis prevention
Metabolic support Diabetes, metabolic syndrome
Immune health Prevention of infectious diseases, support during seasonal colds
Hepatic function Liver support, detoxification
Respiratory health Expectorant, antimicrobial aid in colds and infections
Preventive medicine Anticancer modulation, general antioxidant protection

Dosage (General Traditional Use)
Form Typical Dosage*
Dehydrated garlic powder 1 g/day (to reduce cholesterol)
Fresh garlic clove 1–2 cloves daily
Aged garlic extract Standardized formulations, follow product label
Essential oil Always diluted in carrier oil; not advised internally without medical supervision

*Dosages vary with preparation, standardization, and therapeutic target.

Precautions & Interactions
  • May cause gastric discomfort in large doses.
  • Distinct garlic odor in breath and perspiration.
  • Garlic essential oil is dermocaustic—must be diluted.
  • Contraindicated before surgery (≥7 days) due to antiplatelet activity.
  • May interact with anticoagulants (warfarin, aspirin), antiplatelet drugs, antidiabetic medications, HIV treatments (saquinavir, ritonavir).
  • Caution advised in cases of hypothyroidism.
Storage and Regulatory Notice
  • Store in a cool, dry place, away from heat and direct sunlight.
  • Keep out of reach of children and pets.
  • Do not exceed the recommended daily dose.
  • Not a substitute for a varied diet or medical treatment.
  • Not evaluated by the SAHPRA (South African Health Products Regulatory Authority).
Summary Table of Key Benefits
Health Area Evidence/Benefit
Heart & Vessels Lowers blood pressure and cholesterol, reduces clot risk
Immune System Stimulates immune cells, reduces infection duration
Liver Function Protects against toxins, supports detoxification
Metabolism Helps regulate blood sugar, reduces glycation
Antimicrobial Effective against bacteria, fungi, and parasites
Antioxidant Reduces oxidative stress and cell damage
Cancer Support Potential preventive role against colorectal, stomach & prostate cancers