Cannabis tinctures are among the oldest forms of cannabis medicine — they were the primary cannabis preparation in Western pharmacopeias from the 1850s through cannabis prohibition in 1937. Today, they remain one of the most practical consumption methods: precise dosing, discreet use, long shelf life, no combustion, and rapid onset when administered sublingually.
Making tinctures at home requires minimal equipment and produces a product that is shelf-stable, portable, and easy to dose. The process involves three steps: decarboxylating cannabis (activating THC or CBD), extracting cannabinoids into a solvent (alcohol, glycerin, or oil), and filtering and storing the finished product.
This guide covers all three major solvent methods, the science behind each step, and the math needed to estimate potency.
Step Zero: Decarboxylation
Raw cannabis contains THCA and CBDA — the acidic precursors to THC and CBD. These acidic forms are not psychoactive (in the case of THCA) and have different pharmacological profiles than their decarboxylated forms. Converting THCA to THC and CBDA to CBD requires heat — a process called decarboxylation.
Decarboxylation removes a carboxyl group (COOH) from the molecule, converting THCA (molecular weight 358.5) to THC (molecular weight 314.5). This conversion happens automatically during smoking or vaporizing but must be done as a separate step for tincture preparation.
Optimal Decarboxylation Parameters
The decarboxylation reaction follows first-order kinetics — it proceeds faster at higher temperatures but risks degrading THC to CBN (cannabinol, which is mildly sedating but not significantly psychoactive) if overdone.
| Temperature | Time Required | THC Conversion | CBN Risk |
|---|---|---|---|
| 220°F (105°C) | 45-60 minutes | ~90-95% | Very low |
| 240°F (115°C) | 30-40 minutes | ~95-98% | Low |
| 250°F (121°C) | 25-30 minutes | ~95-98% | Moderate |
| 280°F (138°C) | 15-20 minutes | ~90-95% | High |
The sweet spot for most applications is 240 degrees Fahrenheit for 30-40 minutes. This achieves near-complete decarboxylation with minimal THC-to-CBN degradation.
How to Decarboxylate
- Preheat your oven to 240°F (115°C). Use an oven thermometer to verify — most home ovens are inaccurate by 10-25 degrees.
- Break cannabis into small pieces (roughly pea-sized). Do not grind to powder — this increases surface area for terpene evaporation and makes filtering the tincture more difficult.
- Spread evenly on a parchment-lined baking sheet in a single layer.
- Bake for 35-40 minutes. The cannabis should turn from green to a light golden-brown. If it turns dark brown, the oven ran too hot.
- Remove and let cool completely before extraction.
For CBD-dominant cannabis, the same parameters apply — CBDA converts to CBD through the same decarboxylation reaction with similar kinetics.
Method 1: Alcohol Tincture (Green Dragon)
Alcohol extraction is the gold standard for tinctures. High-proof ethanol is an excellent solvent for cannabinoids because THC and CBD are highly soluble in ethanol — far more soluble than in water, glycerin, or most oils.
Why High-Proof Alcohol Works Best
Cannabinoids are nonpolar molecules. They dissolve readily in nonpolar solvents. Ethanol is a partially polar solvent that dissolves both polar and nonpolar compounds, making it effective at extracting cannabinoids, terpenes, flavonoids, and other plant compounds.
The proof matters. Standard 80-proof vodka (40% alcohol) will extract cannabinoids but less efficiently than 190-proof (95% alcohol) Everclear. The water content in lower-proof spirits also extracts more chlorophyll and plant waxes, producing a tincture that tastes more bitter and plant-like.
| Solvent | Alcohol Content | Extraction Efficiency | Flavor |
|---|---|---|---|
| Everclear 190-proof | 95% | Excellent | Sharp alcohol; minimal plant taste |
| Everclear 151-proof | 75.5% | Very good | Moderate alcohol; some plant taste |
| 100-proof vodka | 50% | Good | Moderate alcohol; more plant taste |
| 80-proof vodka | 40% | Fair | Strong plant taste; more chlorophyll |
Quick Wash Method (QWET)
The Quick Wash Ethanol Technique produces a cleaner, better-tasting tincture by minimizing contact time between the alcohol and plant material.
Materials needed:
- Decarboxylated cannabis (amount based on desired potency)
- 190-proof grain alcohol (Everclear or equivalent)
- Mason jar with lid
- Fine mesh strainer or cheesecloth
- Coffee filters
- Amber dropper bottles for storage
Process:
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Place decarboxylated cannabis and the mason jar in the freezer for at least 2 hours. Cold temperatures reduce chlorophyll extraction and improve the final product’s taste and appearance.
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Remove both from the freezer. Pour enough cold alcohol into the jar to cover the cannabis by approximately half an inch. The ratio is approximately 1 ounce (28g) of cannabis per 8-12 fluid ounces of alcohol for a standard-potency tincture.
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Seal the jar and shake vigorously for 3 minutes. In a quick wash, cannabinoids extract rapidly because they are highly alcohol-soluble. Chlorophyll, waxes, and other undesirable compounds extract more slowly. Three minutes is sufficient for 80-90% cannabinoid extraction while minimizing unwanted compounds.
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Strain immediately through a fine mesh strainer into a clean jar, then filter through a coffee filter for a second pass. The coffee filter removes fine particulate matter.
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Transfer to amber dropper bottles for storage. Amber glass protects cannabinoids from UV degradation. Store in a cool, dark location.
Long Soak Method (Traditional)
For maximum extraction — at the cost of a more plant-forward flavor — the traditional long soak method works as follows:
- Place decarboxylated cannabis in a mason jar. Add enough alcohol to cover by one inch.
- Seal and store in a cool, dark location for 2-4 weeks. Shake the jar once daily.
- Strain through cheesecloth, then coffee filter.
- Transfer to amber dropper bottles.
The long soak extracts essentially all available cannabinoids but also extracts significantly more chlorophyll, tannins, and plant waxes. The resulting tincture is darker, more bitter, and less pleasant sublingually but is no more potent per dose than a well-executed quick wash.
Alcohol Reduction (Optional)
To increase potency per drop, you can reduce the volume of alcohol through evaporation. Pour the strained tincture into a wide, shallow dish in a well-ventilated area (alcohol fumes are flammable — do not use heat or open flame). A small fan accelerates evaporation. Reducing the volume by half doubles the potency per milliliter.
Do not attempt to evaporate all the alcohol — a tincture requires the alcohol as a preservative and carrier. Reducing to approximately 25-50% of the original volume is typical for concentrated tinctures.
Method 2: Vegetable Glycerin Tincture
Vegetable glycerin (VG) is a sugar alcohol derived from plant oils — it is the same food-grade glycerin used in baking and cosmetics. Glycerin tinctures are alcohol-free, making them suitable for people who avoid alcohol for medical, religious, or personal reasons.
The Efficiency Trade-Off
Glycerin is a significantly less efficient solvent for cannabinoids than ethanol. Studies comparing extraction efficiency find that glycerin extracts approximately 33% as much THC as the same volume of 190-proof ethanol. This means glycerin tinctures are inherently less potent per volume than alcohol tinctures made from the same starting material.
To compensate, glycerin tincture recipes typically use a higher cannabis-to-solvent ratio: 1 ounce (28g) cannabis per 4-6 fluid ounces of glycerin.
Process
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Place decarboxylated cannabis in a mason jar. Add food-grade vegetable glycerin at a ratio of approximately 4 fluid ounces per ounce of cannabis.
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Seal the jar and place in a water bath. Heat the water to 170-180°F (77-82°C) — this is well below glycerin’s smoke point and improves extraction efficiency. Maintain this temperature for 2-4 hours. A slow cooker on the “warm” or “low” setting works well. Stir or shake the jar every 30 minutes.
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Alternatively, use the cold extraction method: seal the jar and store in a cool, dark place for 4-8 weeks, shaking daily. This produces a milder-tasting tincture but requires more patience.
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Strain through cheesecloth, squeezing thoroughly to recover as much glycerin as possible. Filter through a coffee filter if desired (glycerin filters slowly — this step is optional).
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Transfer to dropper bottles and store in a cool, dark location.
Pros and Cons of Glycerin
| Attribute | Glycerin Tincture | Alcohol Tincture |
|---|---|---|
| Extraction efficiency | Lower (~33% of ethanol) | Highest |
| Taste | Sweet, pleasant | Sharp, alcohol burn |
| Shelf life | 1-2 years | 3-5+ years |
| Sublingual absorption | Moderate | Good |
| Alcohol-free | Yes | No |
| Ease of use for cooking | Excellent | Good (alcohol flavor) |
Glycerin tinctures taste significantly better than alcohol tinctures — glycerin has a natural sweetness that masks cannabis flavors. They are popular for pediatric and elderly patients and for anyone who finds the alcohol burn of ethanol tinctures unpleasant.
Method 3: MCT Oil Tincture
Medium-chain triglyceride (MCT) oil — typically derived from coconut oil — has become a popular carrier for cannabis tinctures, particularly for CBD products. Cannabinoids are fat-soluble, and MCT oil provides good dissolution and potentially enhanced bioavailability.
Why MCT Oil
MCT oil has several properties that make it an effective cannabis carrier:
Medium-chain fatty acids (C8 caprylic and C10 capric acid) are absorbed more rapidly and completely than long-chain fatty acids found in olive oil or butter. Some research suggests this may improve cannabinoid bioavailability, though human bioavailability studies comparing MCT versus other oil carriers for cannabinoids are limited.
Neutral flavor: High-quality MCT oil has minimal taste, making it a more pleasant carrier than raw coconut oil.
Liquid at room temperature: Unlike coconut oil, which solidifies below 76°F, MCT oil remains liquid, making it practical for dropper-bottle dosing.
Process
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Place decarboxylated cannabis in a mason jar. Add MCT oil at a ratio of approximately 6-8 fluid ounces per ounce of cannabis.
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Heat using a water bath or slow cooker at 160-180°F (71-82°C) for 3-4 hours. The heat improves cannabinoid dissolution into the oil. Stir or shake every 30 minutes. Do not exceed 200°F — higher temperatures degrade cannabinoids.
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Strain through cheesecloth, squeezing to recover oil. Filter through a fine mesh strainer if desired. Coffee filters do not work well with oil — they clog.
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Transfer to dropper bottles and store in a cool, dark location. MCT oil tinctures have a shelf life of approximately 1-2 years when stored properly.
Bioavailability Consideration
All oral cannabinoid preparations have relatively low bioavailability due to first-pass metabolism in the liver. Oral bioavailability of THC is estimated at 6-10%. Sublingual administration (holding the tincture under the tongue for 60-90 seconds) partially bypasses first-pass metabolism by allowing absorption through the sublingual mucosa directly into the bloodstream.
Alcohol tinctures have the best sublingual absorption because ethanol penetrates mucosal tissue effectively. MCT oil and glycerin are absorbed sublingually less efficiently. For all three carriers, swallowing the tincture after sublingual holding provides a secondary absorption route through the GI tract, extending the duration of effects.
Potency Estimation
Knowing approximately how much THC or CBD is in each dose is essential for consistent, safe use. While lab testing is the only way to precisely measure potency, you can estimate potency mathematically.
The Formula
Step 1: Start with your cannabis weight in milligrams. One ounce equals 28,000mg.
Step 2: Multiply by the THC percentage (as a decimal). For cannabis testing at 20% THC, this is 0.20. But remember, the starting material contains THCA, not THC. After decarboxylation, the THCA converts to THC with a mass conversion factor of 0.877 (because the THCA molecule loses the carboxyl group, which represents 12.3% of its mass).
Step 3: Assume extraction efficiency of 80-90% for alcohol, 30-40% for glycerin, and 60-70% for MCT oil.
Step 4: Divide by the number of milliliters (or drops) in your final tincture. One milliliter equals approximately 20-25 drops from a standard dropper.
Example Calculation
Starting material: 7g (7,000mg) of cannabis testing at 20% THC Solvent: 4 fluid ounces (120mL) of 190-proof alcohol Extraction efficiency estimate: 85%
Total available THC = 7,000mg x 0.20 x 0.877 = 1,228mg Extracted THC = 1,228mg x 0.85 = 1,044mg Potency per mL = 1,044mg / 120mL = 8.7mg/mL Potency per drop = 8.7mg / ~22 drops per mL = ~0.4mg/drop
| Starting Material | Solvent (120mL) | Available THC | Extracted THC | Potency per mL |
|---|---|---|---|---|
| 7g at 20% THC | 190-proof alcohol | 1,228mg | ~1,044mg | ~8.7mg/mL |
| 7g at 20% THC | Vegetable glycerin | 1,228mg | ~430mg | ~3.6mg/mL |
| 7g at 20% THC | MCT oil | 1,228mg | ~798mg | ~6.7mg/mL |
| 14g at 20% THC | 190-proof alcohol | 2,456mg | ~2,088mg | ~17.4mg/mL |
These are estimates. Actual potency depends on decarboxylation efficiency, the accuracy of the stated THC percentage (which can vary between lab tests), extraction time and temperature, and how thoroughly you filter the tincture.
Dosing Guidelines
For new users or anyone unfamiliar with the potency of a homemade tincture, start low and go slow.
Sublingual onset: Effects begin within 15-30 minutes and peak at 1-2 hours.
Swallowed onset: Effects begin within 45-90 minutes and peak at 2-3 hours.
A standard starting dose for THC is 2.5-5mg. For a tincture estimated at 8mg/mL, this is approximately 0.3-0.6mL (6-12 drops). Wait at least 2 hours before taking additional doses, as sublingual and oral effects can stack.
For CBD tinctures, starting doses of 10-25mg are common. CBD does not produce psychoactive effects, but individual responses to CBD vary considerably.
Storage and Shelf Life
All cannabis tinctures degrade over time through oxidation, UV exposure, and thermal degradation.
Alcohol tinctures: The longest shelf life — 3-5 years when stored in amber glass in a cool, dark location. Ethanol is itself a preservative that inhibits microbial growth.
Glycerin tinctures: 1-2 years with proper storage. Glycerin does not preserve as effectively as alcohol, and microbial growth is possible in warm or contaminated conditions. Refrigeration extends shelf life.
MCT oil tinctures: 1-2 years with proper storage. MCT oil is resistant to rancidity compared to other cooking oils, but cannabinoid degradation still occurs over time. Refrigeration extends shelf life.
For all tincture types: amber or opaque glass bottles protect against UV degradation. Keep caps tightly sealed to minimize oxidation. Label each bottle with the date of preparation, the estimated potency, the cannabis strain or type used, and the solvent.
Cannabis tinctures offer one of the best ratios of precision to simplicity in the cannabis consumption landscape. A well-made tincture with a calculated potency estimate allows the kind of consistent, measured dosing that smoking and even many commercial edibles cannot match. The upfront effort of making a tincture pays dividends in months of reliable, controllable cannabis use.