Aromatic vinegar is a preparation made by dissolving essential oils in a mixture of acetic acid, alcohol, and water. Unlike the vinegar you cook with, aromatic vinegar was traditionally designed for inhalation and topical use, functioning more like smelling salts than a salad dressing. It has roots in both pharmacy and perfumery, and while it’s largely fallen out of medical use, versions of it still appear in artisanal food products and home remedies.
The Original Pharmaceutical Formula
The most standardized version of aromatic vinegar comes from early pharmaceutical references, where it appeared under the Latin name Acetum Aromaticum. The U.S. National Formulary published a precise recipe: oils of lavender, rosemary, juniper, peppermint, and cinnamon (four drops each), plus larger amounts of lemon and clove oils (eight drops each), dissolved in alcohol and diluted with acetic acid and water. The final product was a strongly scented liquid meant to be held under the nose to revive someone feeling faint or lightheaded.
This placed aromatic vinegar in the same category as smelling salts and vinaigrettes (small perforated containers, not the dressing). The sharp acetic acid fumes, combined with pungent essential oils, were thought to stimulate alertness. Victorian-era women famously carried small bottles of aromatic vinegar for exactly this purpose. The combination worked on a simple principle: the acetic acid irritates the nasal passages just enough to trigger a sharp inhalation reflex, while the essential oils provided a more pleasant smell than pure vinegar.
How It’s Made
All vinegar starts the same way. Yeast feeds on sugar or starch from a plant source (fruit, grain, rice, potatoes), converting it to alcohol. That alcohol is then exposed to oxygen and a specific family of bacteria called Acetobacter, which converts it into acetic acid over weeks or months. The result is a mixture of acetic acid and water, typically between 4% and 7% acid for household vinegar.
Aromatic vinegar adds a layer to this process. The essential oils are first dissolved in alcohol (since oils don’t mix well with water or acid alone), then the acetic acid is added, and finally water brings the preparation to its target volume. In traditional pharmacy, maceration was the standard technique for herbal vinegar preparations: plant material was steeped in the liquid and left to stand for seven days with occasional shaking, allowing the aromatic compounds to fully extract into the vinegar base.
Modern culinary versions use a simpler approach. Herbs like basil, rosemary, or tarragon are placed directly in a bottle of wine vinegar or apple cider vinegar and left to infuse for one to four weeks. The result is a flavored vinegar meant for cooking rather than medicinal use.
Culinary Aromatic Vinegar vs. Medicinal
The term “aromatic vinegar” now covers two very different products, and the distinction matters. Culinary aromatic vinegars are food-grade vinegars infused with herbs, spices, or fruit. They use naturally brewed vinegar (from apples, grapes, rice, or cane) as their base and contain the organic compounds left over from fermentation, which give them color, flavor complexity, and a milder taste. You’ll find these in specialty food stores, often infused with ingredients like garlic, chili, or citrus peel.
The pharmaceutical version uses concentrated acetic acid (much stronger than cooking vinegar) combined with pure essential oils and a high proportion of alcohol. It was never meant to be consumed. The acetic acid concentration alone would make it unpleasant and potentially harmful to swallow. This version has largely disappeared from pharmacies but occasionally surfaces in traditional remedy guides and historical recreations.
Safety Concerns
Whether you’re making an infused culinary vinegar or experimenting with a traditional aromatic preparation, there are real risks worth knowing about.
Skin contact is the most common problem. Vinegar at standard household concentrations (4% to 5% acetic acid) can cause burns if left on skin for extended periods. In one documented case, a woman applied a vinegar-soaked poultice to a twisted ankle for just two hours and developed burns severe enough to require hospitalization and a skin graft a month later. Even a 25-day-old infant suffered first-degree burns on his chest and back from vinegar compresses applied to reduce a fever. The takeaway: vinegar should not be used as a topical treatment on skin, especially not under wraps or bandages that trap it against the body.
Inhalation carries its own risks. Acetic acid vapor irritates the nose, throat, and lungs. At low concentrations (a quick sniff from a bottle), this irritation is brief and harmless, which is exactly how aromatic vinegar was designed to work. But repeated or prolonged exposure to concentrated acetic acid fumes can damage the lining of the respiratory tract. Workplace safety standards cap continuous exposure at 10 parts per million over eight hours, with a short-term maximum of 15 parts per million. You’re unlikely to reach those levels from a bottle of infused vinegar, but using strong acetic acid preparations in a poorly ventilated space could become a problem.
Aromatic vinegars containing essential oils add another variable. Many essential oils (cinnamon, clove, and peppermint among them) can cause skin irritation or allergic reactions on their own. Combined with acetic acid, the potential for irritation increases. If you’re making a traditional aromatic vinegar at home, treat it as you would any concentrated essential oil product: keep it away from eyes and broken skin, use it in ventilated areas, and store it out of reach of children.
Modern Uses
In cooking, herb-infused vinegars remain popular for dressings, marinades, and finishing sauces. A rosemary or tarragon vinegar can add depth to a vinaigrette that plain wine vinegar can’t match. These are straightforward to make at home: place clean, dry herbs in a bottle of your preferred vinegar, seal it, and let it sit in a cool, dark place for two to four weeks before straining.
The medicinal tradition survives mostly in niche herbal practice and historical curiosity. You’ll occasionally find “four thieves vinegar,” a related preparation with its own folklore, sold in herbalist shops or online. Some aromatherapy practitioners use diluted vinegar-and-oil blends as room fresheners, though modern diffusers with pure essential oils have largely replaced this approach. The sharp, clean scent of aromatic vinegar still has fans, but it occupies a much smaller space than it did when every well-equipped medicine cabinet contained a bottle.