Onion Oil18,00 € inc. VAT
Availability: In stock
Cold-Pressed & Macerated Oils
Onion Oil
18,00 € inc. VAT
What you get
100% cold-pressed Onion Bulb Oil · Allium cepa · 100 ml · UV-protect black dropper
Best for
Hair growth ritual (pre-wash) · weak-looking roots · scalp refresh · marks & uneven look (appearance) · dry areas
Results
Refreshed scalp feel · stronger-looking roots · healthier-looking shine · improved appearance of marks over time
Availability: In stock
Botanical origin
Allium cepa
Onion (Allium cepa) has a particularly strong research base for hair and scalp applications. The organosulfur compounds in onion — including diallyl disulfide and quercetin — have been studied for their ability to support scalp circulation, strengthen hair follicles and promote the conditions for healthy hair density. Cold-pressing Allium cepa seeds extracts this full organosulfur and quercetin profile without the intense odour associated with fresh onion juice, producing a stable, concentrated botanical oil that can be used consistently as a pre-wash scalp treatment. The cold-press extraction preserves both the fragile organosulfur compounds and the quercetin content — the two most bioactively significant components for scalp and hair applications.
Best for
Allium cepa seeds — cultivated across the Mediterranean, Middle East and Central Asia since antiquity as one of humanity's oldest agricultural crops
100 ml · UV-protective black glass dropper bottle
Science
Active compounds
Organosulfur Compounds (diallyl disulfide)
Scalp Circulation & Follicle SupportThe primary bioactive compounds in Allium cepa seed oil. Organosulfur compounds, including diallyl disulfide, support scalp microcirculation and create conditions that support the follicle environment. These compounds are the main reason onion-derived preparations have been studied for hair density support in multiple clinical contexts.
Quercetin
Antioxidant & Anti-inflammatoryOne of the most potent naturally occurring flavonoid antioxidants. Quercetin protects hair follicles and skin cells against oxidative stress, has documented anti-inflammatory activity, and contributes to the overall protective environment at the scalp surface during the pre-wash treatment ritual.
Allicin
Antimicrobial & AntifungalA thiosulfinite compound formed when alliin in onion is converted by the enzyme alliinase. Allicin has documented broad-spectrum antimicrobial and antifungal activity — particularly relevant for the scalp, where fungal imbalance can contribute to flakiness, irritation and an unfavourable follicle environment.
Vitamins A, C & E + Minerals
Scalp NourishmentAllium cepa seed oil is nutritionally rich, with vitamins A, C and E providing antioxidant support alongside minerals including sulfur, selenium, zinc and calcium — essential minerals for keratin production (the primary structural protein of hair) and overall scalp cell health.
Application
How to use
01
Section the scalp
Part hair into sections and apply half to one dropper of onion oil directly along each part line. Focus on areas where shedding or thinning is most visible.
02
Massage 3–5 minutes
Massage the scalp firmly with circular movements for at least 3–5 minutes. The mechanical stimulation of massage works synergistically with the organosulfur compounds to support scalp circulation. Frequency matters more than single-session duration — use 2–4 times per week for a minimum of 8–12 weeks.
03
Leave & shampoo
Leave for 30–60 minutes (overnight under a shower cap for maximum effect). Wash with a gentle shampoo — 2 washes are usually needed. Follow with conditioner on lengths and ends.
Ritual combinations
Pairs well with
Castor Oil
The most widely used natural hair density combination: castor oil's ricinoleic acid conditions the hair shaft and follicle while onion's quercetin and organosulfur compounds support scalp circulation. Blend 1:1 for an intensive weekly scalp treatment.
View oil →Rosemary Oil
Onion's organosulfur scalp support pairs with rosemary's documented circulatory-stimulating and follicle-nourishing activity. Together they address the hair density concern from two complementary botanical directions — the most complete natural hair density duo.
View oil →Garden Cress Oil
Garden cress adds omega-3 nourishment and vitamin K to onion's organosulfur scalp action. The vitamin K content of garden cress specifically supports improved scalp microcirculation — synergistic with onion's own circulatory mechanisms.
View oil →From the journal
Onion Seed Oil (Cold-Pressed): The Pungent Powerhouse for Revitalized Hair and Resilient Skin
The organosulfur and quercetin science behind Allium cepa's documented hair density supporting properties — why cold-pressed onion seed oil captures the active fraction without the characteristic fresh onion odour.
Read the articleQuestions
Frequently asked
Onion-derived preparations have been studied for hair loss in multiple clinical contexts. The organosulfur compounds in Allium cepa support scalp circulation and follicle environment, while quercetin provides antioxidant protection. Results require consistent use — 2–4 times per week over at least 8–12 weeks.
Cold-pressed onion seed oil has a significantly milder aroma than fresh onion juice. The characteristic sulfurous smell is greatly reduced in the pressed oil. After washing with a gentle shampoo (two washes recommended), the smell does not persist on the hair.
Apply half to one dropper to the scalp in sections, massage firmly for 3–5 minutes, leave 30–60 minutes, then shampoo thoroughly. Use 2–4 times per week. Hair growth cycles are slow — consistent use over at least 8–12 weeks is needed to assess results.
For face use, onion oil is primarily suited to post-blemish marks and antioxidant support. Apply 1 tiny drop directly to a mark at night, 4–6 times per week. Apply 1 drop mixed into moisturiser as an antioxidant booster 2–3 times per week. Avoid open blemishes, eye area and irritated skin.