Course 13: Botanical Medicine
Lesson 3 of 12. These notes synthesize uploaded historical botanical lectures with separately identified current safety guidance. Traditional uses are not evidence of clinical efficacy or a prescribing directive.
Infusion versus decoction
- Infusions steep leaf and flower material in water; decoctions involve heating harder material such as roots, bark or rhizomes. The source lectures provide illustrative steeping and decoction times. Actual process and dose are species-, constituent-, and product-specific.
Tinctures and extraction ratios
- A tincture commonly uses ethanol-water to extract and preserve constituents. An extraction ratio such as 1:5 records the starting crude herb to liquid ratio, not the final active-ingredient amount. Identify fresh-versus-dry starting material, ethanol percentage and dose.
Powders and capsules
- Powdered herbs and capsules can improve portability, but grinding affects stability and contamination exposure. Standardized extract and crude powder are not equivalent gram-for-gram. Check excipients and swallowing ability.
Oil-based and topical products
- Oils, salves and creams target different constituent classes and routes. Topical availability is not permission to use a toxic herb on broken skin. Consider contact allergy, infection, and systemic absorption.
Quality control at dispensing
- Verify appearance, identity, storage, expiry, batch, labelling and professional scope. Do not assume that boiling neutralizes all toxins or that herbal extraction ratios prove clinical effectiveness.
Applied clinical case
A student suggests substituting 500 mg of dry root powder for 500 mg of a concentrated extract. Is this automatically equivalent?
Show model reasoning and clinical disposition
No. A standardized extract differs in extraction yield and marker concentration. Compare exact species, plant part, formulation, standardization, evidence and label before substitution.
Knowledge checks
- Which plant parts are commonly suited to infusions?
- What does a 1:5 extraction ratio indicate?
- Why are powder and extract doses not interchangeable?
Source and safety links
- Health Canada: Natural Health Products (licensing, NPN, risk) (external)
- NCCIH: Herbs at a Glance (evidence and safety monographs) (external)
- NCCIH: Herb–Drug Interaction Evidence Digest (external)
Downloadable study materials
- Botanical Safety and Toxicity Matrix (PDF)
- Formulation and Posology Worksheet (PDF)
- Herb-Drug Interaction Checklist (PDF)
- Botanical Herb and Action Reference (PDF)
- Complete Botanical Medicine Handbook (12 Lessons) (PDF)
- Exam-Focused Easy-Read Student Handbook (PDF)
- Botanical Medicine 300 MCQs with Explained Answers (PDF)