Garlic: Effects, Usage, and Quality

What is Garlic? Botanical Profile & Origin

Garlic (*Allium sativum*) belongs to the Amaryllidaceae family, specifically to the genus *Allium*, which also includes onions, leeks, and chives. The primary part of the plant used is the bulb, which consists of several individual cloves. *Allium sativum* is believed to have originated in Central Asia, specifically from the steppes of Kazakhstan, Uzbekistan, and Turkmenistan, where it has been cultivated for over 5,000 years.

Garlic cultivation typically occurs as an annual plant, although it is botanically perennial. It thrives best in well-drained, fertile soils and full sun exposure. Planting usually takes place in autumn for a harvest the following summer, or in early spring for a late summer/early autumn harvest. The bulbs are harvested when the lower leaves begin to yellow and dry, but 5-6 green leaves are still present. After harvesting, the bulbs are dried (cured) for several weeks in a warm, dry, and well-ventilated area to improve their shelf life and flavor.

The Power Compounds in Garlic: Sulfur Compounds in Focus

The characteristic pungent odor and many of the health benefits of garlic are due to its sulfur-containing compounds. The most important precursor is **alliin**, an odorless amino acid derivative. When garlic is crushed, chopped, or chewed, the enzyme **alliinase** (stored in separate vacuoles) is released and converts alliin into **allicin**. Allicin is very unstable and rapidly breaks down into a variety of other sulfur compounds, including:

• **Ajoenes**: (E)- and (Z)-ajoenes, which arise from allicin and are known for their antithrombotic properties.
• **Vinyldithiins**: 2-vinyl-4H-1,3-dithiin and 3-vinyl-4H-1,2-dithiin.
• **Diallyl sulfides (DAS), diallyl disulfides (DADS), diallyl trisulfides (DATS)**: These are responsible for much of garlic's aroma and biological activity.
• **S-allylcysteine (SAC) and S-allylmercaptocysteine (SAMC)**: These are water-soluble compounds found primarily in aged garlic extract (AGE). They are stable, odorless, and highly bioavailable.

Other notable compounds include flavonoids (e.g., quercetin), saponins, phenolic acids, and selenium, all of which contribute to garlic's comprehensive profile.

The History of Garlic: A Treasure of Folk Medicine

The history of garlic as a medicinal plant is as old as civilization itself. Around the world, it has been, and continues to be, appreciated not only as a culinary highlight but also as a powerful natural remedy.

Garlic in Traditional Medicine

• **Ayurveda**: In Ayurveda, garlic is known as "Rasona" and has been revered for millennia. It is considered a strong rejuvenating agent (Rasayana) and is traditionally used to balance Vata and Kapha doshas, although it can aggravate Pitta in excess. It is valued for its warming, pungent, and stimulating properties.
• **Traditional Chinese Medicine (TCM)**: Garlic (大蒜, *dà suàn*) has been used in TCM for thousands of years. It is considered warm and pungent and enters the meridians of the spleen, stomach, and lungs. Traditionally, it is used to dispel cold, eliminate toxins, kill parasites, and treat dysentery, coughs, and digestive problems.
• **European Folk Medicine**: Garlic has a long and rich history in European folk medicine, dating back to ancient Greece and Rome. Hippocrates, the "father of medicine," prescribed garlic for a variety of ailments, including infections, indigestion, and fatigue. Pliny the Elder documented its use for various diseases. During the Middle Ages and beyond, it was a common remedy for colds, flu, fever, parasitic infections, and as an antiseptic for wounds. It was also used to ward off the plague and other infectious diseases.

Traditional Applications and Preparations

Historically, garlic was used for cardiovascular health ("blood thinning"), respiratory diseases (cough, bronchitis, asthma), digestive complaints (indigestion, flatulence, intestinal parasites), infections (bacterial, fungal, viral), skin diseases (warts, fungal infections), and as a general tonic to boost vitality. Traditionally, it was consumed raw, crushed, or chopped in food. It was also prepared as tinctures, infused oils, poultices, and decoctions. Garlic milk (cooked with milk) was a common remedy for respiratory problems and worms.

Cultural Significance of Garlic

Beyond its medicinal applications, garlic held significant cultural and spiritual importance in many civilizations. In some cultures, it was believed to ward off evil spirits, vampires, and negative influences. It was often hung in homes or worn as an amulet for protection. Its strong aroma and potent properties contributed to its mystique and veneration.

What Science Says: Garlic in Research Focus

Modern science has extensively examined the traditional uses of garlic. Numerous studies, from clinical trials to laboratory analyses, investigate the potential health benefits of this impressive plant.

Cardiovascular Health: Blood Pressure and Cholesterol

Garlic has proven particularly promising in relation to cardiovascular health:

• **Blood Pressure**: Several studies suggest that garlic supplements can help lower blood pressure, especially in people with hypertension.

• **Cholesterol**: The effects of garlic on cholesterol levels are more complex. While some earlier studies showed modest reductions in total and LDL cholesterol, more recent, well-designed studies have been more inconsistent.

Immune Function and Colds

Garlic is traditionally used to strengthen the immune system, and here too, there is promising scientific evidence:

Further Exciting Research Areas

• **Antimicrobial Effect**: Numerous reviews highlight the broad antimicrobial activity of garlic against bacteria, fungi, viruses, and parasites, primarily attributed to allicin and its derivatives.
• **Anticancer Potential**: In vitro and animal studies have shown that garlic compounds can inhibit the growth of cancer cells, induce apoptosis, and modulate detoxification enzymes, suggesting potential chemopreventive effects.
• **Antioxidant Activity**: Garlic compounds show significant antioxidant activity by scavenging free radicals and strengthening the body's own antioxidant enzymes, contributing to their protective effects against oxidative stress.
• **Anti-inflammatory Effects**: Studies suggest that garlic can modulate inflammatory pathways by inhibiting pro-inflammatory cytokines and enzymes like COX-2, contributing to its therapeutic potential in inflammatory diseases.

Garlic in the Kitchen: More Than Just Spice

Garlic is indispensable in almost any kitchen. Its intense aroma gives dishes a special depth and flavor. Whether raw, fried, roasted, or as an ingredient in sauces – the possibilities for use are almost unlimited. Even a small amount can transform the taste of an entire dish.

When cooking with garlic: the longer it cooks, the milder its taste becomes. For a more intense aroma, it should be added towards the end of the cooking time. Raw garlic offers the strongest health benefits, as the heat-sensitive enzyme alliinase can be inactivated at high temperatures.

Usage & Dosage of Garlic

Garlic can be integrated into everyday life in various ways, whether through fresh cloves in cooking or as a dietary supplement.

Fresh Garlic

To optimally utilize the positive effects of allicin, it is recommended to crush fresh garlic (chop, press) and let it rest for about 10-15 minutes before consumption or cooking. This gives alliinase time to convert alliin into allicin. Consume it raw in salads, dips, or as a seasoning.

Garlic as a Dietary Supplement

For a more consistent intake of the active ingredients, dietary supplements are a good option. These come in various forms such as capsules (often with odorless garlic extract or alliin/allicin standardization), tablets, or powders. The choice of preparation can be crucial, as the stability and bioavailability of the sulfur compounds can vary.

Important note: The optimal dosage can vary depending on individual needs, health status, and product concentration. Always start with a lower dose and consult a doctor or pharmacist if in doubt.

Important Notes & Possible Side Effects

Although garlic is generally well-tolerated, there are some important points to consider, especially regarding its potent active ingredients.

EFSA & EU Authorization Status of Garlic

Many health claims for *Allium sativum* have been submitted to EFSA (European Food Safety Authority) under Regulation (EC) No 1924/2006. However, most specific health claims for garlic remain on the **"on hold" list** or have been **rejected** due to insufficient evidence to establish a cause-and-effect relationship according to EFSA's strict scientific criteria. This does not necessarily mean that the effects do not exist, but rather that the submitted data did not meet EFSA's high requirements for an authorized claim. Examples of "on hold" claims include:

• "Contributes to normal immune function." (ID 1990)
• "Contributes to the maintenance of normal cholesterol levels." (ID 1991)
• "Contributes to the maintenance of normal heart health." (ID 1992)
• "Contributes to the maintenance of normal blood pressure." (ID 1993)
• "Contributes to vascular health." (ID 1994)
• "Contributes to antioxidant protection." (ID 1995)

For this reason, as a brand, we are not allowed to make direct healing claims, but we want to inform you thoroughly about the extensive research and traditional use.

General Safety and Tolerability

The most common side effects of garlic are bad breath and body odor, heartburn, nausea, vomiting, and diarrhea, especially with high consumption or on an empty stomach. Allergic reactions are rare but can occur, manifesting as rashes or breathing difficulties.

Interactions

• **Anticoagulants**: Garlic can enhance the effect of anticoagulant medications (e.g., warfarin, aspirin) and increase the risk of bleeding. Be sure to consult your doctor if you are taking such medications.
• **Blood pressure-lowering medications**: Since garlic itself can have blood pressure-lowering properties, it could enhance the effect of blood pressure-lowering medications.
• **HIV medications**: High-dose garlic can reduce the concentration of certain HIV medications (e.g., saquinavir) in the blood.
• **Before surgery**: Due to its potential blood-thinning effect, garlic consumption or the use of garlic supplements should be discontinued before surgical procedures or dental treatments.

Pregnant and breastfeeding women should only consume garlic in medically effective amounts after consulting a doctor. Children and individuals with sensitive stomachs should dose garlic carefully.