Garlic
Garlic (Allium sativum) is a member of the same botanical family as onions, leeks and chives. It has been used as both food and a traditional herbal ingredient for centuries and contains a distinctive group of sulfur-containing compounds that contribute to its flavour, aroma and biological activity.
Garlic is most commonly used in supplements for cardiovascular health, healthy circulation and immune support.
Alliin, Allicin and Sulfur Compounds
Whole garlic contains a sulfur-containing compound called alliin and an enzyme called alliinase.
When fresh garlic is crushed or chopped, these components interact to form allicin, a reactive sulfur compound responsible for many of garlic's characteristic properties.
Allicin itself is relatively unstable and can quickly form other sulfur-containing compounds.
Processing therefore has a major influence on the composition of garlic supplements. Garlic powder, oils, aged extracts and concentrated extracts can provide different profiles of active compounds, so two products labelled simply as "garlic" are not necessarily equivalent.
Garlic and Cardiovascular Health
Garlic has been researched extensively for cardiovascular health.
Studies suggest some garlic preparations may produce modest improvements in total cholesterol, LDL cholesterol and blood pressure in people whose levels are elevated, although results vary between products and studies.
Garlic also influences platelet activity and several processes associated with normal blood-vessel function.
For everyday wellness, it is best used as one component of a heart-healthy approach that also includes regular exercise, sufficient fibre, appropriate body weight, healthy dietary fats and management of blood pressure and cholesterol where required.
Supporting Healthy Circulation
The cardiovascular system depends on healthy blood vessels and efficient blood flow to deliver oxygen and nutrients throughout the body.
Garlic has a long history of use in circulation formulas and is commonly paired with herbs such as ginkgo, hawthorn, ginger and cayenne.
This makes it particularly relevant to broader nutritional strategies supporting cardiovascular health and peripheral circulation, including blood flow to areas such as the hands and feet.
Garlic and Immune Function
Garlic has also traditionally been used during periods of seasonal illness.
Its sulfur compounds and other plant constituents have been studied for antimicrobial and immune-related activity, although human clinical evidence for preventing common respiratory infections remains limited.
Garlic is therefore better viewed as a food and botanical ingredient that supports normal immune wellbeing rather than a treatment for infection.
Adequate sleep, nutrition, exercise and appropriate intake of nutrients such as vitamin C, vitamin D and zinc remain important foundations of immune health.
Digestive and Respiratory Support
Garlic has traditionally been used to support both digestive and respiratory wellbeing.
Its strong sulfur-containing compounds give it distinctive sensory and biological properties, although concentrated garlic can also cause reflux, nausea, gas or digestive discomfort in some people.
Taking garlic supplements with food may improve tolerance for people who find concentrated extracts irritating on an empty stomach.
Garlic Supplements vs Fresh Garlic
Fresh garlic is a valuable whole-food ingredient and contributes a range of sulfur compounds and plant nutrients to the diet.
Supplementation offers a more consistent and concentrated way to consume garlic without needing to eat large amounts each day.
The two can comfortably exist within the same diet: fresh garlic contributes flavour and food-based nutrition, while a concentrated extract can provide a defined daily amount for people seeking targeted supplementation.
Using Garlic Safely
Concentrated garlic supplements can influence platelet function and may increase bleeding risk.
People taking anticoagulant or antiplatelet medication, including warfarin or aspirin, should discuss supplementation with their healthcare professional. Garlic supplements are also commonly discontinued before surgery because of their potential influence on bleeding.
High-dose supplemental garlic during pregnancy or breastfeeding should be discussed with a qualified health professional.
Garlic supplements intended for humans should not be given to dogs or cats unless specifically directed by a veterinarian. Members of the Allium family can be harmful to pets at sufficient doses.
Garlic in O2B Products
At O2B Healthy, garlic is available in O2B Garlic as a high-strength, odourless extract for cardiovascular, circulatory and immune support. It is also included in O2B Circulation+ alongside ginkgo, hawthorn, ginger, cayenne and vitamin C, creating a broader formula supporting healthy blood flow, blood-vessel function, peripheral circulation and cardiovascular wellbeing.