Calendula extract comes in two main forms that pull different sets of beneficial compounds from the flower: an oil infusion captures fat-soluble constituents like the anti-inflammatory faradiol esters, while an alcohol-based tincture draws out water-soluble flavonoids and polyphenols. Both are straightforward to make at home with dried calendula petals and a bit of patience, but the method you choose shapes what ends up in the final product and what you can do with it.
Why Oil and Alcohol Pull Different Compounds
Calendula flowers contain a wide range of active compounds, including flavonoids, triterpenoids, carotenoids, saponins, and volatile oils.1PubMed Central. An Updated Review on the Multifaceted Therapeutic Potential of Calendula officinalis L. The catch is that these compounds have different chemical personalities. Some dissolve readily in fats (lipophilic), while others need water or alcohol to come out of the plant material (hydrophilic). No single solvent grabs everything.
The major anti-inflammatory triterpenoid esters in calendula, particularly faradiol palmitate, myristate, and laurate, are lipophilic.2PubMed. Preparative purification of the major anti-inflammatory triterpenoid esters from Marigold (Calendula officinalis) These dissolve well into carrier oils like olive or sunflower oil but barely move into alcohol or water. Carotenoids, which give the petals their deep orange color, are also fat-soluble. Flavonoids such as rutin and quercetin, on the other hand, dissolve much more readily in alcohol-water mixtures. Research on calendula extraction has confirmed this split directly: a study using a two-phase system found that a 70% ethanol-water mixture pulled out the hydrophilic compounds while sunflower oil simultaneously captured the lipophilic ones.3Bani Waleed University Journal of Humanities and Applied Sciences. Sustainable Two-Phase Extraction of Flavonoids and Carotenoids from Calendula Flowers for Pharmaceutical Applications
This is the practical reason herbalists have long made both preparations. An oil infusion and a tincture are not interchangeable versions of the same thing. They are complementary extracts, each carrying a different slice of what the plant has to offer.
How to Make Calendula-Infused Oil
A calendula oil infusion is one of the simplest herbal preparations. You need dried calendula flower heads (not fresh, because the residual moisture invites mold), a carrier oil, and a clean glass jar. Olive oil is the traditional choice, though sunflower, sweet almond, and jojoba oil all work well. Sunflower oil has the advantage of being a mild, neutral base with good skin compatibility, and it was actually the oil phase used in the two-phase extraction study mentioned above.
Fill a clean, dry mason jar about halfway to two-thirds full with dried calendula petals. Pour in enough oil to cover the plant material by at least an inch, pressing down gently to release air pockets. Cap the jar tightly. From here, you have two approaches:
- Cold infusion: Place the sealed jar in a sunny windowsill or warm spot and let it sit for four to six weeks, shaking it gently every day or two. The warmth from sunlight speeds extraction without degrading heat-sensitive compounds. This is the most common home method and produces a rich, deep-orange oil.
- Warm infusion: Set the jar in a slow cooker or double boiler filled with a few inches of water, and keep it on the lowest heat setting for four to eight hours. The oil should stay warm but never reach a simmer. This accelerates extraction considerably and gives you a finished product in a single day.
Once the infusion time is up, strain the oil through cheesecloth or a fine-mesh strainer, squeezing out as much liquid as possible from the spent petals. Bottle the strained oil in a dark glass container and store it in a cool, dark place. Label it with the date. A well-made calendula oil, stored properly, typically lasts about a year before the carrier oil begins to go rancid, though this depends on the oil you chose. Adding a small amount of vitamin E oil (about half a teaspoon per cup of infused oil) can help extend shelf life by acting as an antioxidant.
How to Make a Calendula Tincture
A tincture uses alcohol as the solvent instead of oil, which means it captures the flavonoids, phenolic acids, and other water-soluble compounds that oil leaves behind. The standard approach for most home tinctures calls for a solvent strength between 40% and 70% alcohol. For calendula specifically, a higher percentage around 60-70% ethanol is ideal if you want to maximize extraction of both flavonoids and some of the resinous compounds.
The process is similar in structure to an oil infusion. Fill a glass jar about halfway with dried calendula petals. Pour in enough alcohol to fully submerge the plant material, again with an inch or so of headspace above the petals. Vodka (typically 40% alcohol) works as a readily available option, though 190-proof grain alcohol diluted to around 60-70% gives better extraction. Cap the jar and store it in a cool, dark place for four to six weeks, shaking it once a day.
After the maceration period, strain the liquid through cheesecloth into a dark glass dropper bottle or tincture bottle. Press the spent flowers firmly to get every last drop. The finished tincture should have a deep amber color and a distinctly herbal, slightly bitter taste. Tinctures have a much longer shelf life than oil infusions. The alcohol acts as a preservative, and a properly made calendula tincture can remain stable for several years.
One practical note: quality matters at the commercial level too. A study evaluating homeopathic mother tinctures found that most met their quality specifications, but one calendula sample showed reduced alcohol content and total solids, suggesting that even manufactured tinctures can fall short if production standards slip.4International Journal of Engineering Science & Humanities. Pharmaceutical Quality Assessment And Physicochemical Evaluation Of Selected Homoeopathic Mother Tinctures Available In Retail Pharmacies Of Bhopal, Madhya Pradesh When making your own, using a reliable alcohol source and enough plant material helps ensure consistency.
Choosing Between Oil and Tincture Based on Use
The decision mostly comes down to how you plan to use the extract. Calendula oil is the better choice for topical skin applications: salves, balms, massage oils, lip balms, and creams. The oil base itself is emollient and skin-friendly, and the fat-soluble triterpenoids and carotenoids it carries are the compounds most associated with calendula’s skin-healing reputation. A randomized trial on acute hand wounds found that calendula treatment led to faster skin regrowth compared to a control group, with the treated group healing in roughly nine days versus thirteen in the untreated group.5PubMed Central. Treatment of acute wounds in hand with Calendula officinalis L.: A randomized trial Animal research has also found calendula oil effective for wound healing.6Journal of Midwifery. The Effectiveness Of Giving Calendula Oil On Wound Healing In White Rats (Rattus Norvegicus)
A tincture, on the other hand, is easier to take internally (a few drops diluted in water or tea) and is the preferred form for oral and mucosal uses. The flavonoids and polysaccharides extracted by alcohol are associated with anti-inflammatory and immunomodulatory effects that make calendula tincture useful as a mouth rinse for gum irritation or oral sores.7Medicine in Evolution. Antimicrobial spectrum and mucosal tissue healing effects of hydroalcoholic Calendula extracts Tinctures are also more convenient for adding to homemade sprays, compresses, or diluted washes where you want a water-compatible extract rather than an oil film.
Some herbalists make both and use them for different situations: the oil for dry skin, minor cuts, and diaper rash; the tincture for internal support, gargling, or adding to water-based formulations. If you only want to make one, think about your primary use case. Skin care points to oil. Internal or oral use points to tincture.
Getting the Best Starting Material
The quality of your extract depends heavily on the quality of the flowers you start with. Calendula officinalis is the species you want, the common pot marigold with large, deeply orange flower heads. Do not confuse it with French marigold (Tagetes species), which is a different genus entirely and has a different chemical profile.
If you grow your own calendula, harvest the flower heads in full bloom on a dry morning after the dew has evaporated. The resinous stickiness you feel on the petals is a good sign: that stickiness comes from the triterpenoid-rich resins you are trying to extract. Pick flowers regularly throughout the blooming season, because the plant responds to deadheading by producing more blooms.
Dry the harvested flowers thoroughly before using them in either preparation. Spread them in a single layer on a screen or drying rack in a warm, well-ventilated area out of direct sunlight. They should feel papery and crackle when squeezed, typically within a week. Any residual moisture is the enemy of a good extract: in oil, it encourages microbial growth and rancidity; in tincture, it dilutes the alcohol concentration below the level needed for proper extraction and preservation.
If you are buying dried calendula, look for whole flower heads rather than loose petals, since whole heads retain their volatile compounds better. The color should still be vibrant orange, not faded to pale yellow, which suggests age or poor storage. Buy from suppliers who store their herbs in airtight containers away from light and who can tell you the harvest date.
Shelf Life, Storage, and Rancidity
Oil-based extracts are the more perishable of the two. The carrier oil itself gradually oxidizes over time, and this process accelerates with heat, light, and air exposure. Olive oil and sunflower oil both contain natural antioxidants like alpha-tocopherol (vitamin E), and research has shown that the presence of certain herbal compounds can help preserve these antioxidants and delay rancidity.8PubMed. Preservation of alpha-tocopherol in sunflower oil by herbs and spices Calendula’s own antioxidant compounds likely contribute some protective effect, but it is still wise to store your infused oil in a dark glass bottle, in a cool cupboard, and to use it within six months to a year.
Signs your calendula oil has gone off include an unpleasant, sharp or “painty” smell, a change in color toward brownish tones, or a tacky texture. If you notice any of these, discard the oil. Rancid oil can be irritating to the skin, which defeats the purpose.
Tinctures are far more forgiving. A calendula tincture made with at least 40% alcohol can last three to five years if stored in a tightly sealed dark glass bottle at room temperature. The alcohol prevents microbial growth and slows the degradation of the dissolved compounds. Just keep the bottle away from heat and direct light, and make sure the cap seals well to prevent evaporation.
Allergy and Safety Considerations
Calendula is generally well tolerated, but it is a member of the Asteraceae (daisy) family, which is a common allergen group. About 2% of allergic patients in one study reacted to marigold allergens, with reactions ranging from contact dermatitis to rare cases of severe anaphylaxis.9PubMed Central. Asteraceae species as potential environmental factors of allergy Patch-testing data from another study confirmed a similar rate, with roughly 2% of tested patients showing sensitization to marigold.10PubMed. The seamy side of natural medicines: contact sensitization to arnica (Arnica montana L.) and marigold (Calendula officinalis L.)
If you are allergic to ragweed, chrysanthemums, chamomile, or other plants in the daisy family, test any calendula product on a small patch of skin before applying it more broadly. Wait 24 hours and watch for redness, itching, or swelling. For internal use of a tincture, start with a very small dose.
Pregnant and breastfeeding women are traditionally advised to avoid calendula internally, because some herbalism traditions consider it a mild uterine stimulant. The evidence base for this caution is thin, but given the lack of safety studies in pregnancy, erring on the side of caution is reasonable. Topical use during pregnancy is generally considered lower risk, but checking with a healthcare provider first is sensible if you have concerns.
Beyond the Kitchen Counter
The home methods described above are folk-infusion techniques: effective, time-tested, and perfectly adequate for personal use. But it is worth knowing that they do not extract everything the plant has to offer. Industrial and research-grade extraction methods can pull a wider range of compounds more efficiently. Supercritical carbon dioxide extraction, for instance, uses pressurized CO2 as a solvent to selectively extract calendula’s oleoresin without leaving behind solvent residues, though the overall yield tends to be lower than conventional solvent methods.11Chemical Engineering and Processing: Process Intensification. Marigold (Calendula officinalis L.) oleoresin: Solubility in SC-CO2 and composition profile
Researchers have also experimented with deep eutectic solvents, which are mixtures of natural compounds that act as tailor-made extraction media. One study found that these solvents pulled out roughly 16 milligrams per gram of phenolics and 12 milligrams per gram of flavonoids, while a hydrophobic version of the solvent was better at capturing carotenoids.12Journal of Molecular Liquids. Natural bioactive chemicals extracted from Calendula officinalis using efficient binary deep eutectic solvent system These techniques are not practical for home use, but they reinforce the core lesson: different solvents capture different things. Your simple kitchen infusion is doing the same thing in miniature.
Making a Dual Extract
Some herbalists take the polarity split to its logical conclusion and make a combined preparation. The idea is simple: make both an oil infusion and a tincture from the same batch of flowers (or separate batches), and then blend a small amount of the tincture into the finished oil using an emulsifier like beeswax or lecithin. The result is a salve or cream that theoretically carries both the fat-soluble triterpenoids and the water-soluble flavonoids.
The two-phase research approach confirms the logic behind this. When researchers simultaneously used an ethanol-water phase and a sunflower oil phase on calendula flowers, they captured hydrophilic and lipophilic bioactives at the same time.3Bani Waleed University Journal of Humanities and Applied Sciences. Sustainable Two-Phase Extraction of Flavonoids and Carotenoids from Calendula Flowers for Pharmaceutical Applications You can approximate this at home by making your oil and tincture separately and combining them into a finished formulation.
A basic approach: melt beeswax into your warm calendula oil (about one ounce of beeswax per cup of oil for a firm salve, less for a softer balm), then stir in a tablespoon or two of your calendula tincture while the mixture is still liquid but cooling. The alcohol in the tincture will largely evaporate as the salve sets, leaving the water-soluble compounds distributed through the wax-oil matrix. The texture may be slightly grainier than a pure oil salve, but the finished product carries a broader chemical profile than either extract alone. Store dual-extract salves the same way you would store plain calendula oil: in a sealed container, away from heat and light, and plan to use them within six to nine months.