Indian Coleus (Coleus forskohlii)

What is Coleus forskohlii?

Coleus forskohlii — also known as Pashanabhedi, Makandi or Indian Coleus — is a perennial aromatic herb with fleshy tuberous roots, purple tubular flowers and green, ovate leaves with serrated margins. It is botanically classified under the Lamiaceae family and closely resembles other aromatic herbs like mint and basil. Long valued in Ayurveda as a cardiovascular and digestive tonic, it is now gaining scientific attention for its active compound forskolin, which influences key biochemical pathways in fat metabolism, blood pressure regulation and thyroid function.

In Ayurveda, Coleus is known for its ability to "break stones" (Pashanabhedi) and to regulate the Vata and Kapha doshas. It is traditionally used to support digestion, circulation and the heart, and today is widely applied in weight management and metabolic health formulations.

Where Does It Grow?

Coleus forskohlii thrives in warm, sunny locations and is often cultivated as a commercial herb crop for its economically valuable root. It is native to the subtropical and warm-temperate regions of South Asia.

Geographical Distribution

• India — especially the Deccan Plateau and South India
• Nepal
• Sri Lanka
• Thailand

Ideal Growing Conditions

• Climate — warm, subtropical conditions with plenty of sunlight
• Altitude — flourishes across the plains and lower hill slopes
• Soil — well-drained, fertile soils that favour healthy root development
• Rainfall — moderate; grown as a commercial root crop in sunny locations

Parts Used & Phytochemical Constituents

The tuberous roots are the primary part used, although the aerial parts may carry mild activity of their own. The root's value lies in a distinctive group of labdane diterpenes, with forskolin as its signature bioactive.

• Forskolin — a labdane diterpenoid with broad pharmacological activity
• Other diterpenes — dehydroxyforskolin and coleonol
• Essential oils, sterols and flavonoids

Forskolin is unique among plant compounds for its direct activation of adenylate cyclase, which raises intracellular levels of cAMP — a vital signalling molecule that governs fat breakdown, vascular tone, bronchial relaxation and hormone release.

Functional Benefits of Coleus forskohlii

Coleus offers systemic benefits through its regulatory influence on enzymes, hormones and cellular signals — particularly those governing the cardiovascular, metabolic and respiratory systems.

Weight & metabolic support

• Increases cellular cAMP, promoting fat breakdown (lipolysis)
• Supports healthy weight management alongside diet and exercise
• Standardized Coleus extracts are often included in herbal weight-management supplements

Cardiovascular health

• Acts as a vasodilator, relaxing blood vessel walls
• Supports healthy systolic and diastolic blood pressure already within the normal range
• Supports heart function without affecting heart rate
• Used traditionally as a cardiotonic in Ayurveda, particularly for Vata-type cardiac concerns

Respiratory support

• Relaxes bronchial smooth muscle through cAMP modulation
• Supports open airways and clear, comfortable breathing
• Forskolin inhalation has been shown to improve breathing in clinical trials

Thyroid & glucose balance

• Stimulates thyroid hormone release (T3 and T4)
• May support those with a sluggish metabolism (under supervision)
• Enhances insulin sensitivity and glucose utilization in experimental models

Eye health

• Forskolin influences intraocular pressure when applied topically as eye drops
• Explored in ophthalmic formulations that support normal eye pressure

How to Use Coleus forskohlii Safely

Coleus should be used under supervision when taken for specific health concerns, especially those involving blood pressure or thyroid function. Common forms include:

• Root powder (Churna) — traditionally used in Ayurveda
• Standardized extracts — containing 10–20% forskolin
• Capsules / tablets — commercially prepared for metabolic or cardiac health
• Topical or ophthalmic formulations — for specialized applications

Key Research Highlights

Modern research strongly supports Coleus's pharmacological properties, particularly the action of forskolin as a cAMP elevator, with diverse applications in nutrition and wellness.

• Body composition — clinical studies show reduced body-fat percentage and improved lean mass in adult volunteers using forskolin extract
• Blood pressure — forskolin supports healthy blood pressure without causing reflex tachycardia
• Respiratory function — inhaled forskolin improved forced expiratory volume (FEV1) in adult participants
• Thyroid — studies show increased T3 and T4 levels without affecting TSH

Precautions & Contraindications

Although Coleus is well tolerated, its strong physiological activity warrants careful use in certain populations:

• Pregnancy and lactation — avoid due to potential uterine stimulant effects
• Low blood pressure (hypotension) — may lower it further
• Heart medications — may potentiate the effects of calcium channel blockers or beta-blockers
• Bleeding tendencies — may increase bleeding risk; avoid before surgery

Coleus forskohlii bridges ancient wisdom and modern science, offering benefits in cardiovascular function, metabolic balance, healthy weight management and respiratory support. With forskolin as its signature bioactive, it is one of the few herbal agents with direct intracellular signalling action via cAMP elevation — and while promising and well-researched, its potent effects reward careful, personalized use under knowledgeable guidance.

References

1. Godard, M. P., Johnson, B. A., Richmond, S. R. (2005). Obesity Research, 13(8), 1335–1343.
2. Borrelli, F., et al. (2004). Pharmacological effects of forskolin: A review. Natural Product Communications, 69(10), 763–768.
3. Suen, C. S., et al. (1986). Effect of forskolin on thyroid function in vitro. Endocrinology, 119(5), 2027–2032.
4. Tashkin, D. P., et al. (1984). Clinical Pharmacology & Therapeutics, 35(5), 675–679.