Holy Basil (Tulsi)

Supplements · Adaptogens & Stress Herbs · Supplement, Typed Supps

An adaptogen central to Ayurvedic tradition, now studied for stress.

Stage by stage

Intake (Extract capsule or tea): Active compounds absorbed in the small intestine.
Small intestine (Absorbed): Absorbed alongside other plant compounds in the extract.
Bloodstream (Influences stress response): Circulates and appears to influence the body’s stress-response system, similar in category to ashwagandha.
Consistent use (Builds over weeks): Effects are studied over weeks of consistent use.

What the evidence supports

Reducing symptoms of stress and anxiety — limited evidence. A systematic review of small human trials reports favourable effects on stress and mood, but the studies are small, short and sometimes uncontrolled.
Modestly lowering blood glucose in type 2 diabetes — limited evidence. Small trials suggest a modest fall in fasting glucose, but they are limited in size and quality.
Evidence on long-term safety and effects on fertility — insufficient evidence. Human trials rarely exceed three months, and animal studies raise unresolved questions about effects on fertility.

Typical dose

300–1,200 mg/day of extract (or around 2,500 mg of leaf powder), usually split

Upper limit: No established UL; most trials ran 1–3 months

Timing

With food, standard dosing.

Time to effect

Weeks: Reported stress-related effects in studies.

Medication interactions

Antidiabetic medication: Additive blood-sugar lowering, risking hypoglycaemia. (moderate)

Common myth

“Holy basil works immediately for stress.” In reality: Like most adaptogens, its studied benefits build with consistent daily use rather than a single dose.