Infusion vs Decoction
How EU regulators define infusion, decoction and maceration, which plant parts each suits, and what lab studies (but no human trials) say about the difference.
Content last updated . This page has not been medically reviewed.
Safety first. Supplements can cause side effects and interact with medicines. Read mushroom safety and interactions before you use any mushroom product.
A note before you read
This page explains words used by regulators. It is not a recipe. Some plants carry special warnings, and a method that suits one plant may not suit another. For plants with serious cautions, see comfrey, coltsfoot and pyrrolizidine alkaloid teas. The EU herbal committee itself notes that different preparations may exert different actions and in some circumstances have a different safety profile. [1]The question
What is the difference between an infusion and a decoction, and does it matter for what ends up in the cup?How the sources define the terms
These definitions come from the European Medicines Agency's herbal committee (HMPC, EU, 2016) leaflet template for herbal teas sold as traditional herbal medicines. The times below are the template's stated defaults "when not otherwise specified", quoted as regulatory description and not as advice. [1]| Infusion | Decoction | Maceration | |
|---|---|---|---|
| What it is | Boiling water poured over the herbal substance, left to steep. [1] | Cold water poured on the herbal substance, heated to the boil and simmered. [1] | The herbal substance soaked in water at room temperature. [1] |
| Time named as the default | Usually 5 to 15 minutes [1] | Usually 15 to 30 minutes [1] | Usually 30 minutes [1] |
| Usually suited to | Leaves, flowers and delicate parts [1] | Roots, rhizomes and barks (decoction or maceration) [1] | Roots, rhizomes and barks (decoction or maceration) [1] |
| Limits stated | Boiling water is important for lowering the microbial bioburden of the herbal substances. [1] | Generally not applicable to herbal substances containing volatile active constituents. [1] | Gentle heating below boiling is called "digestion". [1] |
The same document says aromatic herbs like mint may be infused at the end of a decoction, and that tea mixtures may need different methods for different ingredients. [1] For infusions it says to keep the infusion covered in the fridge for no more than 24 hours if not drunk soon after preparation. [1] More on the terms: infusion, decoction and maceration defined, steeping time and water temperature and EU herbal monographs explained.
What research found
| Question | What the source found | Strength of evidence | Form and population |
|---|---|---|---|
| Human outcomes of infusion versus decoction of the same plant | Proper evidence not found. We searched PubMed on 2026-10-23 for records with both "infusion" and "decoction" in the title plus herbal or plant in the title or abstract: 7 records, all lab chemistry or cell studies by title. [2] | Insufficient evidence | None found in humans |
| German chamomile (Matricaria recutita L.) | A lab study found both preparations had antioxidant activity. The infusion and the plant methanol extract slowed growth of two human cancer cell lines, while the decoction showed no such activity in that test. [3] | Preclinical (cells) | Cell cultures, not people |
| Rose geranium (Pelargonium graveolens, green plant material) | The decoction had a higher total phenolic content (31.2) than the infusion (27.05 mg GAE per g dry matter). [4] | Preclinical (chemistry) | Lab analysis |
Lab measures such as phenolic content or antioxidant tests are biomarkers, not health outcomes, and the plants differ, so these results do not show that one method is better for people. Whether a lab difference matters in a drinking cup was not examined in the sources we read.
No universal winner
Infusion and decoction suit different plant parts, according to the EU definitions, and no human study we found shows one beating the other. For a specific herb, follow what its monograph or label says and ask a pharmacist.Frequently asked questions
What is the main difference between infusion and decoction?
In the EU definitions, an infusion pours boiling water over the herb and steeps it, while a decoction heats the herb in water to a boil and simmers it. [1]
Which plant parts suit a decoction?
The EU template says infusion is usually appropriate for leaves, flowers and delicate parts, and decoction or maceration for roots, rhizomes and barks. [1]
Why is decoction not used for aromatic herbs?
The template says decoction is generally not applicable to herbal substances containing volatile active constituents. [1]
Does a decoction contain more of the plant's compounds?
It depends on the plant and the compound. In one lab study of rose geranium the decoction had more phenolics, and in a chamomile study the preparations differed in cell tests. [4][3] No human study we read compared the two.
Is maceration the same as cold brewing?
The EU template defines maceration as soaking at room temperature, usually 30 minutes by default. [1] Cold brew safety is a separate topic: see cold brew and iced herbal tea safety.
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Safety and limits
- Hot water and very hot drinks: see hot tea and esophageal cancer risk.
- Medicines, pregnancy and children depend on the plant, not the method; see medicine interactions.
- Stronger-looking or longer-boiled drinks are not shown safer or better in the sources we read. Ask a pharmacist or clinician about a particular herb.
References
- European Medicines Agency, Committee on Herbal Medicinal Products (HMPC). Patient Leaflet template concerning advice on the preparation of herbal teas as (traditional) herbal medicinal products by end-users, EMA/HMPC/30603/2012, adopted 20 September 2016. Read 2026-10-23.
- PubMed searches by NCBI E-utilities, run 2026-10-23: PubMed. Terms and counts are given in the text and in the evidence log; record titles and abstracts were checked.
- Guimaraes R, et al. Infusion and decoction of wild German chamomile: bioactivity and characterization of organic acids and phenolic compounds. Food Chemistry. 2013. PubMed 23122148 (abstract read 2026-10-23).
- Ennaifer M, et al. Phytochemicals, antioxidant, anti-acetylcholinesterase, and antimicrobial activities of decoction and infusion of Pelargonium graveolens. Natural Product Research. 2020. PubMed 30584784 (abstract read 2026-10-23).