Coleus forskohlii: What It Is, Benefits, Dosage, and Sources

Nutrientic Team

April 4, 202613 min read

Coleus forskohlii is an herb with a long history in traditional medicine, particularly in Ayurvedic practices. It's best known for its active compound, forskolin, which has been the subject of various scientific investigations. This article explores what Coleus forskohlii is, its purported benefits, common dosages, potential side effects, and where it can be found.

Understanding Coleus forskohlii and Forskolin

Coleus forskohlii is a perennial plant belonging to the mint family (Lamiaceae), native to subtropical regions of India, Nepal, and Thailand. For centuries, its tuberous roots have been used in Ayurvedic medicine for a range of conditions, from respiratory issues to cardiovascular health. The plant's primary bioactive component is forskolin, a labdane diterpenoid.

Forskolin works by activating an enzyme called adenylate cyclase. This enzyme is crucial for increasing levels of cyclic adenosine monophosphate (cAMP) within cells. CAMP is a vital secondary messenger involved in numerous biological processes throughout the body, including hormone signaling, metabolism, and immune function. The widespread role of cAMP is why forskolin has been investigated for such a diverse array of potential health applications.

When discussing Coleus forskohlii, it's important to differentiate between the whole herb extract and isolated forskolin. Most research focuses on standardized Coleus forskohlii extracts, which are typically concentrated to contain a specific percentage of forskolin (e.g. 10% or 20%). While forskolin is the most studied compound, other constituents in the whole plant extract might also contribute to its effects, though this area is less understood.

Investigating Potential Benefits

The proposed benefits of Coleus forskohlii and its active compound, forskolin, stem from its ability to increase cellular cAMP levels. This mechanism has led researchers to explore its impact on various physiological systems.

Weight Management

One of the most widely discussed and researched applications of Coleus forskohlii is its potential role in weight management. The theory is that by increasing cAMP, forskolin can stimulate the breakdown of stored fats (lipolysis) in fat cells. It may also influence thyroid hormone function, which plays a role in metabolism.

Research on Coleus forskohlii supplementation for weight management has yielded mixed results. For example, some preliminary human trials indicate it may help reduce body fat, especially in overweight individuals, even without significant changes in overall body weight. This suggests a potential shift in body composition. However, these findings are not entirely consistent across all studies, and any observed effects appear modest. More extensive, well-designed clinical trials are necessary to reach definitive conclusions. It's important to remember that Coleus forskohlii is not a miracle weight loss solution and should not replace a healthy diet and exercise.

Respiratory Health

Historically, Coleus forskohlii was used in traditional medicine for respiratory conditions. Modern research has begun to explore this use, particularly concerning asthma. Forskolin's ability to increase cAMP can lead to the relaxation of smooth muscles, including those in the airways. This bronchodilatory effect could potentially help alleviate symptoms in conditions like asthma. Some in-vitro and animal studies have shown promising results, suggesting that forskolin might help open airways. However, human clinical trials specifically on asthma are limited, and it's not currently recommended as a primary treatment.

Cardiovascular Health

Another traditional use of Coleus forskohlii relates to heart health. Forskolin has been observed to have a positive inotropic effect, meaning it can increase the force of heart muscle contraction. It also has vasodilatory properties, which can lead to the widening of blood vessels and a subsequent reduction in blood pressure. These effects are also mediated by increased cAMP. While these properties are of interest, particularly in conditions like congestive heart failure, using Coleus forskohlii for cardiovascular issues requires careful consideration due to its potential impact on heart rate and blood pressure, especially in individuals already on medication.

Eye Health (Glaucoma)

Preliminary research has explored the use of forskolin for glaucoma, a condition characterized by increased pressure inside the eye (intraocular pressure). Studies, primarily in animal models and some small human trials, suggest that forskolin, when applied topically or taken orally, might help reduce intraocular pressure. This effect is thought to be related to its ability to influence fluid dynamics within the eye. More strong human trials are needed to confirm these findings and establish its efficacy and safety for glaucoma management.

Other Potential Applications

Beyond these primary areas, Coleus forskohlii and forskolin have been investigated for a range of other potential applications, including:

Skin health: Some research suggests it might play a role in conditions like psoriasis, due to its anti-inflammatory properties and influence on cellular processes.
Cognitive function: The ability of forskolin to cross the blood-brain barrier and influence cAMP in the brain has led to speculation about its potential effects on memory and learning, though research in this area is very nascent.
Depression: Similarly, due to cAMP's role in neurotransmission, some early studies have explored its potential in mood disorders, but this is far from established.

It's crucial to emphasize that for many of these potential uses, the research is still in its early stages, often limited to in-vitro studies, animal models, or small human trials. Further extensive research is required to substantiate these claims and determine appropriate, safe, and effective applications.

Dosage and Administration

Determining an effective and safe dosage for Coleus forskohlii can be challenging due to variations in extract standardization and individual responses. Most scientific studies have used standardized extracts, typically containing 10% to 20% forskolin.

Condition/Goal	Typical Forskolin Content	Suggested Daily Dosage (Extract)	Notes
Weight Management	10-20%	250-500 mg, 2-3 times per day	This would provide 25-100 mg of pure forskolin daily. Some studies have used dosages up to 500 mg of 10% extract twice daily.
General Well-being	10-20%	100-250 mg, 1-2 times per day	Lower dosages are often used for general supplementation.
Glaucoma (topical)	N/A	Specific eye drop formulations	This is a specialized application and should only be used under medical supervision, if at all, with specific formulations. Oral administration for glaucoma has also been explored, often at similar dosages to weight management, but is less common.

Important Considerations:

Start Low, Go Slow: If you decide to try a Coleus forskohlii supplement, begin with the lowest recommended dose and gradually increase it, monitoring your body's response.
Standardization: Always check the label for the percentage of forskolin in the extract. A 250 mg capsule of 10% forskolin extract is different from a 250 mg capsule of 20% forskolin extract.
Timing: Some suggest taking it with meals to minimize potential stomach upset, but specific timing instructions are often product-dependent.
Consult a Professional: Given its potential effects on various bodily systems, it is advisable to consult a healthcare provider before starting any Coleus forskohlii supplement, especially if you have pre-existing health conditions or are taking other medications.

Potential Side Effects and Safety Concerns

While generally considered safe for short-term use in healthy individuals at recommended doses, Coleus forskohlii is not without potential side effects and contraindications. Its mechanism of action, primarily increasing cAMP, can influence various physiological processes, leading to some adverse reactions.

Common Side Effects

Gastrointestinal Distress: Some users report mild side effects such as nausea, stomach upset, or loose stools, especially when first starting supplementation or at higher doses.
Headaches: Headaches have been reported by some individuals.
Increased Heart Rate/Palpitations: Due to its potential impact on cardiovascular function, some individuals may experience a slight increase in heart rate or palpitations. This is more likely at higher doses or in sensitive individuals.
Low Blood Pressure: As it can cause vasodilation, Coleus forskohlii might lead to a drop in blood pressure, which could manifest as dizziness or lightheadedness, particularly in those prone to low blood pressure.

Serious Concerns and Contraindications

Bleeding Risk: Forskolin has been shown to have anti-platelet effects, meaning it can inhibit blood clotting. This raises concerns about an increased risk of bleeding, especially in individuals with bleeding disorders or those taking anticoagulant (blood-thinning) medications like warfarin, aspirin, or clopidogrel.
Cardiovascular Conditions: Individuals with heart conditions, especially those on medications for blood pressure or heart rate, should exercise extreme caution or avoid Coleus forskohlii. Its effects on blood pressure and heart contractility could interact negatively with such medications.
Pregnancy and Breastfeeding: There is insufficient reliable information about the safety of Coleus forskohlii during pregnancy and breastfeeding. Therefore, it is strongly advised to avoid its use during these periods.
Surgery: Due to its potential to increase bleeding risk, it's generally recommended to stop taking Coleus forskohlii at least two weeks before any scheduled surgery.
Drug Interactions:

Blood Pressure Medications: Coleus forskohlii* can lower blood pressure, potentially leading to dangerously low blood pressure when combined with anti-hypertensive drugs.

* Blood Thinners: As mentioned, it can increase the risk of bleeding when taken with anticoagulant or anti-platelet medications.

* Asthma Medications: While forskolin has bronchodilatory properties, its interaction with prescribed asthma medications (e.g. beta-agonists) is not well-established and could potentially lead to adverse effects.

Nitrates: Combining Coleus forskohlii* with nitrates (often used for chest pain) could lead to a significant drop in blood pressure.

General Safety Advice:

Always purchase Coleus forskohlii supplements from reputable manufacturers to ensure product quality and accurate labeling. The supplement industry is not as tightly regulated as pharmaceuticals, so purity and potency can vary. If you experience any adverse reactions, discontinue use and consult a healthcare professional.

Coleus forskohlii in Traditional and Modern Contexts

The journey of Coleus forskohlii from ancient Ayurvedic texts to modern scientific laboratories highlights the ongoing interplay between traditional wisdom and contemporary research.

Traditional Uses

In Ayurveda, Coleus forskohlii (often referred to by its Sanskrit name, Makandi) has been valued for centuries. Its roots were traditionally used to address a variety of ailments. Key traditional applications included:

Cardiac health: Used to support heart function and manage blood pressure.
Respiratory conditions: Employed to alleviate symptoms of asthma and other breathing difficulties.
Digestive issues: Sometimes used to aid digestion and address intestinal spasms.
Skin conditions: Applied topically or taken internally for certain skin complaints.
Urinary health: Believed to have diuretic properties.

These traditional uses were based on empirical observation and generations of accumulated knowledge, often without a detailed understanding of the underlying biochemical mechanisms.

Modern Scientific Exploration

The isolation of forskolin in the 1970s marked a turning point, allowing scientists to investigate the specific pharmacological actions of this compound. This led to a focused interest in its effects on cAMP and its potential therapeutic applications.

Modern research, as discussed earlier, has largely centered on validating and expanding upon these traditional uses, using controlled experimental designs and molecular analysis. While traditional medicine often uses the whole plant or complex herbal preparations, modern science frequently isolates specific compounds to understand their effects more precisely. This approach allows for standardized dosing and a clearer understanding of potential benefits and risks.

Current Landscape of Coleus forskohlii Supplements

Today, Coleus forskohlii is primarily available as a dietary supplement, usually in capsule or tablet form. Most commercial products are standardized extracts, indicating the percentage of forskolin they contain.

When considering a Coleus forskohlii supplement, it's important to:

Check for standardization: Look for products that specify the percentage of forskolin. This indicates a more consistent product.
Reputable brands: Choose brands that are known for quality control and third-party testing to ensure purity and potency.
Ingredient list: Be aware of other ingredients or fillers that might be present.

While Coleus forskohlii continues to be a subject of scientific interest, it remains largely within the realm of dietary supplements rather than mainstream pharmaceuticals. Its role is often seen as complementary, supporting overall health and well-being, rather than a primary treatment for specific diseases.

Natural Sources of Coleus forskohlii

As a plant, Coleus forskohlii is the direct natural source of forskolin.

Botanical Origin: The plant Plectranthus barbatus (syn. Coleus forskohlii) grows wild in the mountainous regions of India, Nepal, and Thailand. It prefers warm, humid climates and well-drained soil.
Root Extraction: The active compounds, particularly forskolin, are concentrated in the tuberous roots of the plant. These roots are harvested, dried, and then processed to create extracts for supplements.
Cultivation: Due to increasing demand, Coleus forskohlii is also cultivated in various regions to ensure a sustainable supply for the supplement industry. While the plant itself is a "natural source," consuming the raw root is not a practical or recommended way to obtain forskolin. The concentration of forskolin in raw roots can vary significantly, and proper extraction and standardization are necessary to ensure a consistent and potentially effective dose. Therefore, most individuals interested in the benefits of Coleus forskohlii turn to commercially prepared supplements.

Frequently Asked Questions

What is Coleus forskohlii used for?

Coleus forskohlii is primarily used for its active compound, forskolin, which has been investigated for various potential benefits. These include supporting weight management by influencing fat breakdown, aiding respiratory health through bronchodilation, and potentially assisting in cardiovascular health by affecting blood pressure and heart function. It has also seen some preliminary research for eye health (glaucoma) and other areas, though more research is needed for many of these uses.

What are the benefits of taking forskolin?

The potential benefits of taking forskolin are largely attributed to its ability to increase cellular cyclic adenosine monophosphate (cAMP) levels. This mechanism may lead to:

Fat breakdown: Potentially aiding in body composition improvement.
Airway relaxation: Which might support respiratory function.
Blood pressure reduction: Through vasodilation.
Increased heart muscle contraction: Which could have implications for heart function.

However, the evidence for many of these benefits is still developing, with some studies showing modest effects and others being inconclusive.

What are the side effects of taking forskolin?

Common side effects of taking forskolin can include mild gastrointestinal upset, headaches, increased heart rate, and a drop in blood pressure. More serious concerns involve an increased risk of bleeding, especially in individuals with bleeding disorders or those taking blood-thinning medications. It can also interact with medications for blood pressure and heart conditions. Pregnant or breastfeeding individuals and those undergoing surgery should avoid its use. Always consult a healthcare provider before starting any supplement.

Conclusion

Coleus forskohlii, with its active compound forskolin, represents a compelling example of a traditional herb undergoing modern scientific scrutiny. While its historical uses are broad, contemporary research has focused on its impact on weight management, respiratory function, and cardiovascular health, all primarily driven by its ability to modulate cAMP levels.

For curious readers seeking clear information, it's evident that while Coleus forskohlii holds promise, particularly in its potential to influence metabolism and certain physiological processes, the scientific evidence supporting many of its purported benefits is still evolving. Studies often show modest effects, and results are not always consistent. Furthermore, the importance of proper dosage, standardization, and awareness of potential side effects and drug interactions cannot be overstated. Anyone considering a Coleus forskohlii supplement should approach it with caution and ideally consult a healthcare professional to ensure it's appropriate for their individual health profile.