Onion water is a simple preparation made by infusing water with sliced or chopped onions, gaining attention as a traditional home remedy. This preparation extracts compounds from the bulb into the liquid, which is then consumed or applied externally. This article will explore the specific components transferred into the water and the claims associated with its use.
Nutritional Components and Antioxidant Power
Onion water contains beneficial compounds that transfer from the bulb during infusion. Onions are known for their sulfur compounds, including thiosulfinates, which contribute to the bulb’s sharp smell and flavor. These molecules are believed to provide certain therapeutic effects.
The water also extracts flavonoids, a type of plant pigment with antioxidant properties. The most notable is quercetin, which is highly concentrated in onions. Quercetin acts as a scavenger, helping to neutralize unstable molecules and reduce cellular damage.
Trace amounts of vitamins and minerals are also present. Onions are a source of Vitamin C, which contributes to immune function and collagen production. The liquid may also contain B vitamins, such as folate and B6, and minerals like potassium, which play roles in metabolism and maintaining fluid balance.
Internal Health Claims and Digestive Effects
Drinking onion water is often associated with promoting systemic health due to its extracted compounds. Antioxidants like quercetin and Vitamin C support the body’s defense mechanisms. Intake of these compounds may help mitigate oxidative stress, which is involved in the development of chronic conditions.
Certain sulfur compounds are studied for their potential role in managing blood sugar levels. They may influence glucose metabolism and assist in regulating blood sugar. Onions also contain fructans, a type of prebiotic fiber that feeds beneficial gut bacteria. While most fiber remains in the solid onion, the water can extract some components, supporting gut health and digestion.
The anti-inflammatory properties of quercetin are believed to contribute to cardiovascular health. Onion compounds may support the function of the heart and blood vessels by helping to reduce inflammation and potentially lower blood pressure. Note that many systemic benefits are extrapolated from studies on concentrated onion extracts or whole onion consumption, not specifically the water infusion.
Topical Applications for Skin and Hair
Onion water is a popular component in folk remedies for external use, particularly for the hair and scalp. The sulfur content is thought to be beneficial for hair health, as sulfur is a component of keratin, the protein that makes up hair strands. Applying the liquid as a rinse is sometimes claimed to stimulate blood flow to the scalp, which could encourage hair growth.
The antibacterial and antifungal properties of onion compounds are leveraged for scalp health. These properties may help calm an itchy scalp, reduce dandruff caused by fungi, and soothe conditions like scalp dermatitis. Preliminary research suggests that onion juice, which is more concentrated than the water infusion, may promote hair regrowth in individuals with alopecia areata.
For the skin, the anti-inflammatory and antioxidant properties of quercetin are sometimes used in topical applications for acne and scarring. Onion extract is present in some commercial scar treatment products, and the liquid may help in the healing process by reducing inflammation. However, scientific evidence supporting the effectiveness of diluted onion water for skin or hair is limited, as most studies focus on stronger extracts.
Preparation Guidelines and Safety Considerations
The simplest method for making onion water involves slicing or chopping a raw onion and soaking it in filtered water. The mixture is typically allowed to steep for several hours or overnight to allow the compounds to leach into the water. To minimize the strong flavor, some people boil the onions briefly before steeping, which softens the taste.
Food safety is a concern when preparing infused water with raw vegetables. Onions can harbor bacteria like E. coli, which may multiply when the cut vegetable is left in water. To mitigate the risk of foodborne illness, the onions should be thoroughly cleaned, and the preparation must be kept refrigerated.
It is recommended to consume the water infusion within a few hours if not refrigerated, or within one to two days if stored in the refrigerator. Potential side effects include digestive issues such as heartburn, gas, and stomach upset, especially for sensitive individuals. When using the water topically, perform a patch test first, as the sulfur compounds can cause skin or scalp irritation.