MK Ultra
aka MK Ultra OG, MKU, MK-Ultra
MK Ultra is a legendary indica-dominant hybrid (G13 x OG Kush) bred by T.H. Seeds in the early 2000s, prized for its intensely sedating, couch-locking effects. With earthy, piney, diesel aromas driven by myrcene and caryophyllene, it delivers deep relaxation, euphoria, and eventual sleepiness. A multiple Cannabis Cup winner, it's a nighttime strain best suited for experienced users seeking serious rest.
The Short Answer
What kind of high is MK Ultra?
Myrcene-led and sweet-pine on the palate, most often reported relaxed and picked for sleep & bedtime at night.
Terpenes decide how a strain feels — THC% only decides how strong the dose is. Here is the family, the chemistry behind it, and what people reach for it to do.
Terpenes are the aromatic compounds that shape the character of a high. The blend a strain carries — not its THC percentage — is what makes one feel bright and social and another heavy and sleepy, which is why the top three are listed rather than just the leader.
Terpene percentages belong to the jar, not the strain. They move with harvest timing, drying, cure and shelf age — the lighter ones literally evaporate. What holds steady is which terpenes lead, so that is what we rank.
See the full profile →Learn how terpenes work →- Sedating
- Muscle relaxant
- Anti inflammatory
- Caryophyllene Spicy, peppery, woody
- Limonene Citrus, lemon, orange
Ordered by measured share — the exact percentages shift with every batch and cure.
The effects reported most often across our research sources. Every body is different — set, setting and tolerance all move the result.
- Sleepy
- Euphoric
The activities this strain gets picked for most often, leading with the specific ones rather than the broad buckets nearly every strain shares. A starting point, not a prescription — what works for you is personal.
See the full list →The flavor notes reported most often across our research sources, led by the most specific one — flavor tracks the terpene blend, but cure, age and how you consume it all shift what actually lands on the palate.
See the full profile →- Earthy
The aroma notes reported most often across our research sources — what the jar gives up before you light it. This is the strain's own recorded profile, not the textbook aroma of its lead terpene.
See the full profile →- Diesel
- Best Time night
- Era 2003
- Rarity Common
Genetics Indica-Dominant Hybrid A lineage label, not an effects predictor — most modern flower is a hybrid, and the terpene mix above is what you will actually notice.
Potency Check the label, not the strain Varies by batch, grower and harvest — check the label on the product you are buying. Scan your label → Reported ranges →
Heads up Most reported: dry mouth and dry eyes. Responses vary — start low, go slow. Review safety →
This strain has its own song — hit play, read along, and chill out.
MK Ultra Soundtrack
AI-generated for this strain
MK Ultra Soundtrack
Verse
Chorus
Verse
Chorus
Bridge
Your guided read
6 chapters on MK Ultra
Start at the top and work down — each chapter builds on the one before it. Jump to any chapter to read it on its own.
- The Experience How this strain is reported to feel, and when people reach for it.
- Look, Aroma & Taste The smell and flavour you will actually notice — and the terpenes behind them.
- Chemistry & Research Therapeutic reports, published research, and what the lab numbers do — and do not — tell you.
- Using It Well Consumption methods that suit this strain, and the side effects to plan around.
- Where It Comes From The genetics, the breeders, and the recognition it has picked up along the way.
- The Full Story The long-form profile and community video reviews, once you want the detail.
Strain Highlights
Key insights at a glance
The Experience
Professor High Says...
In-depth strain breakdown from Professor High, our AI cannabis expert
The moment this one hits, you feel the euphoria wash in fast — bright, warm, almost giddy. But don't get comfortable thinking it's a head-only ride. Within minutes, that myrcene-driven heaviness creeps into your limbs like a slow tide pulling you under. Your muscles loosen, your thoughts soften, and that pine-diesel exhale lingers on your tongue as your body starts negotiating with gravity.
This is a full sedation experience — the kind where creative sparks flicker early but get gently smothered by an irresistible wave of sleepiness. I feel hungry, content, and increasingly horizontal. There's no fighting it once caryophyllene's peppery undertow and that thick myrcene backbone take hold. By the peak, conversation slows to a mumble and the couch becomes a permanent address. This is not a 'do things' high — it's a 'become one with the blanket' high, and honestly, that's exactly the point.
Effects Profile
Relaxed · Sleepy · Euphoric
Best enjoyed during night
Deep relaxation and sleep
Best For
Sleep & Bedtime · Watching TV/Movies · Stress Relief
Effect Sources
- 1 aka MK Ultra OG, MKU - Weed Strains leafly.com(opens in new tab)
- 2 MK Ultra Strain (G13 × OG Kush) strainpedia.com(opens in new tab)
- 3 MK-Ultra™ Feminized Seeds thseeds.com(opens in new tab)
- 4 MK-Ultra - Cannabis Strain | Cannapedia cannapedia.ai(opens in new tab)
- 5 MK Ultra Marijuana Strain Information & Reviews allbud.com(opens in new tab)
- 6 MK Ultra hellomd.com(opens in new tab)
- 7 MK Ultra Marijuana Strain - Kind Green Buds kindgreenbuds.com(opens in new tab)
- 8 MK Ultra Strain Review: Effects & Where to Buy (2026) | Weedpedia weedpedia.ca(opens in new tab)
- 9 Mk-Ultra (TH Seeds) — Strain Info | PhenoDB phenodb.eu(opens in new tab)
- 10 MK Ultra Strain Info & Reviews | HashDash hashdash.com(opens in new tab)
- 11 MK Ultra Strain Review: Potency, Flavor, and Cultivation Tips strngseeds.com(opens in new tab)
- 12 MK Ultra Cannabis: Potent Effects, Powerful Benefits, and Where to Buy It Online - MMJ Express mmjexpress.cc(opens in new tab)
- 13 Diving Deep: An In-Depth MK Ultra Strain Review - Cannabis Wisdom cannabiswisdom.com(opens in new tab)
- 14 Mk-Ultra (TH Seeds) :: Cannabis Strain Info :: SeedFinder.eu seedfinder.eu(opens in new tab)
- 15 MK Ultra (Herbies Seeds) - Herbies Seeds USA herbiesheadshop.com(opens in new tab)
- 16 MK Ultra Strain Guide: Inside Canada's Most Hypnotic Indica bulkweedinbox.cc(opens in new tab)
- 17 MK Ultra Feminized Marijuana Seeds | Crop King Seeds cropkingseeds.com(opens in new tab)
- 18 MK Ultra - Effects, Terpenes & Queens Availability terpbrosnyc.com(opens in new tab)
- 19 MK Ultra Cannabis Strain Diaries growdiaries.com(opens in new tab)
- 20 MK Ultra Seeds | 20% THC | Buy Feminized Seeds blimburnseeds.com(opens in new tab)
20 verified sources
Look, Aroma & Taste
Aroma & Flavor
Earthy · Pine · Diesel
Aroma & Flavor Sources
- 1 aka MK Ultra OG, MKU - Weed Strains leafly.com(opens in new tab)
- 2 MK Ultra Strain (G13 × OG Kush) strainpedia.com(opens in new tab)
- 3 MK-Ultra™ Feminized Seeds thseeds.com(opens in new tab)
- 4 MK-Ultra - Cannabis Strain | Cannapedia cannapedia.ai(opens in new tab)
- 5 MK Ultra Marijuana Strain Information & Reviews allbud.com(opens in new tab)
- 6 MK Ultra hellomd.com(opens in new tab)
- 7 MK Ultra Marijuana Strain - Kind Green Buds kindgreenbuds.com(opens in new tab)
- 8 MK Ultra Strain Review: Effects & Where to Buy (2026) | Weedpedia weedpedia.ca(opens in new tab)
- 9 Mk-Ultra (TH Seeds) — Strain Info | PhenoDB phenodb.eu(opens in new tab)
- 10 MK Ultra Strain Info & Reviews | HashDash hashdash.com(opens in new tab)
- 11 MK Ultra Strain Review: Potency, Flavor, and Cultivation Tips strngseeds.com(opens in new tab)
- 12 MK Ultra Cannabis: Potent Effects, Powerful Benefits, and Where to Buy It Online - MMJ Express mmjexpress.cc(opens in new tab)
- 13 Diving Deep: An In-Depth MK Ultra Strain Review - Cannabis Wisdom cannabiswisdom.com(opens in new tab)
- 14 Mk-Ultra (TH Seeds) :: Cannabis Strain Info :: SeedFinder.eu seedfinder.eu(opens in new tab)
- 15 MK Ultra (Herbies Seeds) - Herbies Seeds USA herbiesheadshop.com(opens in new tab)
- 16 MK Ultra Strain Guide: Inside Canada's Most Hypnotic Indica bulkweedinbox.cc(opens in new tab)
- 17 MK Ultra Feminized Marijuana Seeds | Crop King Seeds cropkingseeds.com(opens in new tab)
- 18 MK Ultra - Effects, Terpenes & Queens Availability terpbrosnyc.com(opens in new tab)
- 19 MK Ultra Cannabis Strain Diaries growdiaries.com(opens in new tab)
- 20 MK-Ultra [T.H. Seeds] | € 21,25 cannapot.com(opens in new tab)
- 21 MK Ultra Seeds | 20% THC | Buy Feminized Seeds blimburnseeds.com(opens in new tab)
21 verified sources
Aromas
Flavors
Terpene Profile
Myrcene leads · 3 terpenes mapped
Terpene Sources
- 1 aka MK Ultra OG, MKU - Weed Strains leafly.com(opens in new tab)
- 2 MK Ultra Strain (G13 × OG Kush) strainpedia.com(opens in new tab)
- 3 MK-Ultra - Cannabis Strain | Cannapedia cannapedia.ai(opens in new tab)
- 4 MK Ultra Marijuana Strain - Kind Green Buds kindgreenbuds.com(opens in new tab)
- 5 MK Ultra Strain Review: Effects & Where to Buy (2026) | Weedpedia weedpedia.ca(opens in new tab)
- 6 MK Ultra Strain Info & Reviews | HashDash hashdash.com(opens in new tab)
- 7 MK Ultra Strain Review: Potency, Flavor, and Cultivation Tips strngseeds.com(opens in new tab)
- 8 MK Ultra Cannabis: Potent Effects, Powerful Benefits, and Where to Buy It Online - MMJ Express mmjexpress.cc(opens in new tab)
- 9 MK Ultra (Herbies Seeds) - Herbies Seeds USA herbiesheadshop.com(opens in new tab)
- 10 MK Ultra Strain Guide: Inside Canada's Most Hypnotic Indica bulkweedinbox.cc(opens in new tab)
- 11 MK Ultra - Effects, Terpenes & Queens Availability terpbrosnyc.com(opens in new tab)
- 12 MK Ultra Seeds | 20% THC | Buy Feminized Seeds blimburnseeds.com(opens in new tab)
12 verified sources
Terpene Distribution
Terpene profile: Myrcene 0.8%, Caryophyllene 0.6%, Limonene 0.4% .
Myrcene Dominant
Flavor: Earthy, musky, fruity
Caryophyllene
Flavor: Spicy, peppery, woody
Limonene
Flavor: Citrus, lemon, orange
Full Profile
Myrcene
0.85%
Flavor Profile:
Earthy, musky, fruity
Effects:
Caryophyllene
0.55%
Flavor Profile:
Spicy, peppery, woody
Effects:
Limonene
0.4%
Flavor Profile:
Citrus, lemon, orange
Effects:
Chemistry & Research
Medical Effects
9 reported therapeutic uses on file
Medical Effect Sources
- 1 aka MK Ultra OG, MKU - Weed Strains leafly.com(opens in new tab)
- 2 MK-Ultra - Cannabis Strain | Cannapedia cannapedia.ai(opens in new tab)
- 3 MK Ultra Marijuana Strain Information & Reviews allbud.com(opens in new tab)
- 4 MK Ultra hellomd.com(opens in new tab)
- 5 MK Ultra Marijuana Strain - Kind Green Buds kindgreenbuds.com(opens in new tab)
- 6 MK Ultra Strain Review: Effects & Where to Buy (2026) | Weedpedia weedpedia.ca(opens in new tab)
- 7 MK Ultra Strain Info & Reviews | HashDash hashdash.com(opens in new tab)
- 8 MK Ultra Strain Review: Potency, Flavor, and Cultivation Tips strngseeds.com(opens in new tab)
- 9 MK Ultra Cannabis: Potent Effects, Powerful Benefits, and Where to Buy It Online - MMJ Express mmjexpress.cc(opens in new tab)
- 10 Diving Deep: An In-Depth MK Ultra Strain Review - Cannabis Wisdom cannabiswisdom.com(opens in new tab)
- 11 Mk-Ultra (TH Seeds) :: Cannabis Strain Info :: SeedFinder.eu seedfinder.eu(opens in new tab)
- 12 MK Ultra (Herbies Seeds) - Herbies Seeds USA herbiesheadshop.com(opens in new tab)
- 13 MK Ultra Strain Guide: Inside Canada's Most Hypnotic Indica bulkweedinbox.cc(opens in new tab)
- 14 MK Ultra Feminized Marijuana Seeds | Crop King Seeds cropkingseeds.com(opens in new tab)
- 15 MK Ultra Cannabis Strain Diaries growdiaries.com(opens in new tab)
- 16 MK Ultra Seeds | 20% THC | Buy Feminized Seeds blimburnseeds.com(opens in new tab)
16 verified sources
Mental Effects
- •Stress Relief
Reduces mental tension and racing thoughts effectively
- •Anxiety Reduction
Calms anxiety symptoms without heavy cognitive impairment
- •Depression Support
Elevates mood and reduces depressive symptoms
- •PTSD Management
Alleviates PTSD symptoms and emotional distress
Professor High visualization
Body Effects
- •Pain Management
Reduces chronic pain and general body discomfort
- •Sleep Support
Promotes deep sleep and reduces insomnia symptoms
- •Muscle Relaxation
Eases muscle spasms and tension throughout body
- •Inflammation Reduction
Decreases inflammatory response in joints and tissues
- •Appetite Stimulation
Increases appetite for users experiencing nausea
Medical Disclaimer: This information is AI-generated based on available research and user reports, provided for educational purposes only, and is not intended as medical advice. Cannabis affects everyone differently. Consult with a qualified healthcare professional before using cannabis for medical purposes. Do not use cannabis if pregnant, nursing, or have a medical condition without consulting your doctor.
What Research Says
Peer-reviewed studies, terpene science & safety guidance
What does the research say about MK Ultra?
MK Ultra is a indica cannabis strain containing up to 25.0% THC, with a terpene profile dominated by Myrcene and Caryophyllene. This page currently has good data confidence. Below are profile sources when available plus authoritative resources for understanding the compounds in this strain.
Terpene Research
Cannabinoid Information
Cannabis Regulations & Safety
Educational resources only — not medical advice. Always consult a qualified clinician for health decisions.
Cannabinoids (THC & CBD)
THC 17-25% · Type I chemovar
THC% tells you how strong. Terpenes tell you how it feels.
THC percentage is a property of the product in your hand, not of the strain. It shifts with the batch, the grower, the harvest, and how the flower was cured and stored — the same strain can test several points apart from two different jars.
Treat the ranges below as market context for what to expect on a shelf — then read the actual label on the product you are buying, and use the terpene profile to judge how it will feel.
High THC (>15%), low CBD (<1%) - Most common recreational strains
Using It Well
Side Effects
Dry Mouth · Dry Eyes · +3 more
Side effects vary by individual. Start low, go slow. Consult a healthcare professional with concerns.
These are commonly reported effects. Individual experiences may vary based on dosage, tolerance, and consumption method.
Where It Comes From
Lineage & History
G13 × OG Kush · bred by T.H. Seeds
Lineage Sources
- 1 aka MK Ultra OG, MKU - Weed Strains leafly.com(opens in new tab)
- 2 MK Ultra Strain (G13 × OG Kush) strainpedia.com(opens in new tab)
- 3 MK-Ultra™ Feminized Seeds thseeds.com(opens in new tab)
- 4 MK-Ultra - Cannabis Strain | Cannapedia cannapedia.ai(opens in new tab)
- 5 MK Ultra Marijuana Strain Information & Reviews allbud.com(opens in new tab)
- 6 MK Ultra hellomd.com(opens in new tab)
- 7 MK Ultra Marijuana Strain - Kind Green Buds kindgreenbuds.com(opens in new tab)
- 8 MK Ultra Strain Review: Effects & Where to Buy (2026) | Weedpedia weedpedia.ca(opens in new tab)
- 9 Mk-Ultra (TH Seeds) — Strain Info | PhenoDB phenodb.eu(opens in new tab)
- 10 MK Ultra Strain Info & Reviews | HashDash hashdash.com(opens in new tab)
- 11 MK Ultra Strain Review: Potency, Flavor, and Cultivation Tips strngseeds.com(opens in new tab)
- 12 MK Ultra Cannabis: Potent Effects, Powerful Benefits, and Where to Buy It Online - MMJ Express mmjexpress.cc(opens in new tab)
- 13 Diving Deep: An In-Depth MK Ultra Strain Review - Cannabis Wisdom cannabiswisdom.com(opens in new tab)
- 14 Mk-Ultra (TH Seeds) :: Cannabis Strain Info :: SeedFinder.eu seedfinder.eu(opens in new tab)
- 15 MK Ultra (Herbies Seeds) - Herbies Seeds USA herbiesheadshop.com(opens in new tab)
- 16 MK Ultra Strain Guide: Inside Canada's Most Hypnotic Indica bulkweedinbox.cc(opens in new tab)
- 17 MK Ultra Feminized Marijuana Seeds | Crop King Seeds cropkingseeds.com(opens in new tab)
- 18 MK Ultra - Effects, Terpenes & Queens Availability terpbrosnyc.com(opens in new tab)
- 19 MK Ultra Cannabis Strain Diaries growdiaries.com(opens in new tab)
- 20 MK-Ultra [T.H. Seeds] | € 21,25 cannapot.com(opens in new tab)
- 21 MK Ultra Seeds | 20% THC | Buy Feminized Seeds blimburnseeds.com(opens in new tab)
- 22 Mk-Ultra Kush | Master of Seeds masterofseeds.com(opens in new tab)
22 verified sources
MK Ultra is an indica-dominant hybrid strain created by crossing G13 and OG Kush, two legendary cannabis genetics. The strain originated in the early 2000s and became known for its powerful sedative effects and high potency.
Origin Timeline
First cultivated in 2003
Breeder
T.H. Seeds
Seed Bank
T.H. Seeds
Awards & Recognition
10 awards & mentions
Award Sources
- 1 aka MK Ultra OG, MKU - Weed Strains leafly.com(opens in new tab)
- 2 MK-Ultra™ Feminized Seeds thseeds.com(opens in new tab)
- 3 MK-Ultra - Cannabis Strain | Cannapedia cannapedia.ai(opens in new tab)
- 4 Mk-Ultra (TH Seeds) — Strain Info | PhenoDB phenodb.eu(opens in new tab)
- 5 MK Ultra Strain Info & Reviews | HashDash hashdash.com(opens in new tab)
- 6 MK Ultra Strain Review: Potency, Flavor, and Cultivation Tips strngseeds.com(opens in new tab)
- 7 MK Ultra Cannabis: Potent Effects, Powerful Benefits, and Where to Buy It Online - MMJ Express mmjexpress.cc(opens in new tab)
- 8 Mk-Ultra (TH Seeds) :: Cannabis Strain Info :: SeedFinder.eu seedfinder.eu(opens in new tab)
- 9 MK Ultra (Herbies Seeds) - Herbies Seeds USA herbiesheadshop.com(opens in new tab)
- 10 MK Ultra Strain Guide: Inside Canada's Most Hypnotic Indica bulkweedinbox.cc(opens in new tab)
- 11 MK Ultra - Effects, Terpenes & Queens Availability terpbrosnyc.com(opens in new tab)
- 12 MK-Ultra [T.H. Seeds] | € 21,25 cannapot.com(opens in new tab)
- 13 MK Ultra Seeds | 20% THC | Buy Feminized Seeds blimburnseeds.com(opens in new tab)
13 verified sources
Competition Wins
2nd · La Bella Flor Cup · 2007 · Indoor
Indoor
View Source (opens in new tab) ↗1st place for Best Indica
Best Indica
View Source (opens in new tab) ↗1st place in the Indica category at the 2003 Cannabis Cup
Indica
View Source (opens in new tab) ↗The Full Story
Detailed Description
The long-form profile · ~3 min read
MK Ultra: The Legendary Sedative Indica
Few strains carry a reputation as fearsome as MK Ultra. Named after the infamous CIA mind-control program, this indica-dominant powerhouse earned its cult status by delivering one of the most heavily sedating cerebral-to-couch experiences in cannabis. Bred by T.H. Seeds in the early 2000s, MK Ultra isn't a strain you casually reach for during the day — it's built for total shutdown.
🧬 Genetic Heritage & Lineage
MK Ultra was created by crossing G13 and OG Kush — two of cannabis's most storied genetic lines. G13 contributes deep, hypnotic body weight and mysterious underground lore of its own, while OG Kush brings its signature earthy-pine backbone and potent psychoactive punch. The result is an 80% Indica / 20% Sativa hybrid classified as a Type II chemovar, meaning it carries a balanced but THC-forward cannabinoid profile. First released by T.H. Seeds around 2003, MK Ultra (also known as MK Ultra OG or MKU) quickly became a benchmark strain for indica intensity.
👃 Terpene Profile & Aromatics
Lab-tested data confirms MK Ultra's terpene profile is led by:
- Myrcene (0.85%) — the dominant terpene responsible for the strain's signature sedative, couch-locking body effect
- Caryophyllene (0.55%) — a peppery, spicy terpene known for its interaction with CB2 receptors, contributing to the strain's pain-relieving potential
- Limonene (0.4%) — a citrus-forward terpene that lifts mood and adds brightness to an otherwise heavy profile
Together these terpenes (roughly 1.8% total terpene content) create a complex aroma of earthy, piney, and diesel notes layered over woody, sweet, and skunky undertones, with hints of spicy and pungent funk rounding out the nose.
👅 Flavor Experience
The flavor mirrors the aroma closely but adds a few extra dimensions on the exhale. Expect an initial hit of earthy and pine flavor, moving into diesel and woody mid-notes, before finishing on sweet, citrus, and even faintly minty or herbal tones. The spicy and skunky finish lingers well after the smoke clears, marking this as a strain with real depth on the palate.
🎯 Effects & Experience
MK Ultra is famous for one thing above all: heavy sedation. Users consistently report a wave of relaxation and euphoria that builds quickly, followed by a drift into sleepiness that can be difficult to fight. Along the way, many notice a happy, creative, or even mildly focused mental state before the body effects take over completely. The hungry effect commonly kicks in as well, making this a strong candidate for appetite support. With THC levels ranging from 17% to 25%, potency varies by phenotype and batch, so dosing matters — this is not a strain to underestimate.
🎮 Use Cases & Activities
Given its intensity, MK Ultra is best reserved for nighttime use when there's nowhere left to be. It pairs well with:
- Winding down after a long day
- Deep relaxation or meditative rest
- Managing chronic muscle tension
- Settling into sleep
This is not a productivity or social strain — it's a full-stop, end-of-day companion.
💚 Medical & Therapeutic Potential
MK Ultra's heavy myrcene and caryophyllene content underpin its therapeutic reputation. Users report it may help with:
- Pain management — caryophyllene's CB2 activity may support relief from chronic discomfort
- Sleep support — myrcene's sedative properties may ease insomnia
- Muscle relaxation — may ease spasms and physical tension
- Stress and anxiety relief — the calming body-forward high may quiet racing thoughts
- Mood support — some report relief from depressive symptoms and PTSD-related distress
🏆 Awards & Recognition
MK Ultra's award history reflects two decades of consistent recognition:
- 1st Place Indica — High Times Cannabis Cup, 2003
- 2nd Place — High Times Cannabis Cup, 2004
- 2nd Place Indoor — La Bella Flor Cup, 2007
- Indica Category — The Karma Cup, 2015
⚠️ Consumer Considerations
MK Ultra is best suited for experienced consumers comfortable with high-potency, heavily sedating indicas. Novices should approach with caution given its reputation for locking users to the couch. Common considerations include dry mouth, dry eyes, occasional dizziness, and in sensitive users, a touch of anxiety — all manageable with hydration and a low-and-slow dosing approach.
Research Methodology
How we compiled this strain profile
This strain profile was compiled from 24 published sources covering 'MK Ultra'. Our research pipeline cross-references these sources and reports how strongly they agree — see the confidence breakdown below.
Data Quality by Section
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Strain Highlights
Key insights at a glance
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