Holy Basil (Tulsi)
The 'incomparable one' in Ayurveda. Gentle adaptogen with strong evidence for cortisol reduction, anxiety, and mild blood sugar support.
Moderate evidence for stress / anxiety reduction (PSS score improvements), mild cognitive support, modest blood sugar and lipid improvements, and antimicrobial / immune support. Effects: 4–8 weeks for stress markers.
Holy basil (Ocimum tenuiflorum / sanctum) is a sacred plant in Hindu tradition, revered as 'the queen of herbs.' Pharmacologically, it's a true adaptogen — modulates HPA axis, lowers cortisol, supports the body's stress response. Modern RCTs support reductions in general anxiety, perceived stress, and forgetfulness, plus modest blood sugar and lipid improvements. Gentler than ashwagandha but with similar profile. Available as capsules, tea, or fresh herb in Indian groceries.
- Form
- Standardised extract to ≥2% ursolic acid. Holy basil tea (loose leaf or bagged — common in Indian and yogic traditions).
- Dose
- 300–600 mg/day standardised extract. Tea: 1–3 cups daily.
- Timing
- AM or split AM/PM. Anytime — gentle, doesn't typically disrupt sleep.
- Schedule
- Daily. Cycle (8 weeks on / 2 off) optional.
- Side effects
- Generally very well-tolerated. Mild GI upset rare. Mild blood sugar lowering.
- Interactions
- Anticoagulants — mild additive blood-thinning. Diabetes medications — additive glucose lowering. Levothyroxine — possible mild thyroid interaction.
- Contraindications
- Pregnancy / breastfeeding (theoretical hormonal effects). Bleeding disorders. Hypothyroidism (caution — animal studies suggest mild T4 lowering).
- Lab markers
- Cortisol (morning, salivary curve). Fasting glucose, HbA1c. Lipid panel.
- Food sources
- Holy basil leaves in Thai cuisine (pad krapow), Indian dishes, and as a fresh herb. Easily added to cooking; medicinal effect requires consistent intake.
Pairs with
Ashwagandha, rhodiola (adaptogen stack). Magnesium glycinate, L-theanine (stress / sleep).
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