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Herb · Hypericaceae family

St John's wort

Hypericum perforatum

Full sun to part shade 0.3–0.9 m × 0.25–0.6 m Flowers June–August to −40 °C
Flower colours Click a colour
Herbal tea (infusion)
Herbal tea · dose1.5–2 gof dried aerial parts
steep5–15 min
how often2–3× a day
Full method

Preparation and use · St John's wort

How to prepare it.

According to the monograph of the European Medicines Agency (EMA).

Part usedAerial parts
temporary mental exhaustionminor skin inflammationto help heal minor superficial woundsmild digestive discomfortnervous restlessness with difficulty falling asleep
Form

part: aerial parts

For: temporary mental exhaustion For whom: From 18 years · adults, elderly

What you use
Herb
How it is used
By mouth
Single dose
1.5–2 g of dried aerial parts in 150 ml of boiling water
How often
2–3× a day
Daily total
3–6 g a day
How long
If symptoms last longer than 2 weeks or get worse, see a doctor.

Method

  1. 1

    Put 1.5–2 g of dried aerial parts in a cup.

  2. 2

    Pour over 150 ml of boiling water.

  3. 3

    Steep for 5–15 min.

    10:00
  4. 4

    Drink 2–3× a day.

For: mild digestive discomfort For whom: From 18 years · adults, elderly

What you use
Herb
How it is used
By mouth
Single dose
2 g of dried aerial parts in 150 ml of boiling water
How often
2× a day
How long
If symptoms last longer than 1 week or get worse, see a doctor.

Method

  1. 1

    Put 2 g of dried aerial parts in a cup.

  2. 2

    Pour over 150 ml of boiling water.

  3. 3

    Steep for 5–15 min.

  4. 4

    Drink 2× a day.

For: nervous restlessness with difficulty falling asleep For whom: From 18 years · adults, elderly

What you use
Herb
How it is used
By mouth
Single dose
2–3 g of dried aerial parts in 150 ml of boiling water
How often
2× a day
How long
If symptoms last longer than 2 weeks or get worse, see a doctor.

Method

  1. 1

    Put 2–3 g of dried aerial parts in a cup.

  2. 2

    Pour over 150 ml of boiling water.

  3. 3

    Steep for 5–15 min.

  4. 4

    Drink 2× a day.

Dosage

FormSingle doseHow oftenFor whomHow longInstructions
Herbal tea (infusion)at homepart: aerial partsfor: temporary mental exhaustion1.5–2 g of dried aerial parts in 150 ml of boiling water 2–3× a day · 3–6 g a day in total From 18 years · adults, elderlylonger than 2 weeks → see a doctor
Herbal tea (infusion)at homepart: aerial partsfor: mild digestive discomfort2 g of dried aerial parts in 150 ml of boiling water 2× a dayFrom 18 years · adults, elderlylonger than 1 week → see a doctor
Herbal tea (infusion)at homepart: aerial partsfor: nervous restlessness with difficulty falling asleep2–3 g of dried aerial parts in 150 ml of boiling water 2× a dayFrom 18 years · adults, elderlylonger than 2 weeks → see a doctor
Compressat homepart: aerial partsfor: minor skin inflammation, to help heal minor superficial wounds2 g of dried aerial parts in 150 ml of water several times a dayFrom 12 years · adolescents, adults, elderlylonger than 1 week → see a doctor
Children under 12: not recommended

How long

If symptoms last longer than 2 weeks or get worse, see a doctor. — for: temporary mental exhaustion, nervous restlessness with difficulty falling asleep · From 18 years · adults, elderly

If symptoms last longer than 1 week or get worse, see a doctor. — for: mild digestive discomfort, minor skin inflammation, to help heal minor superficial wounds

Who should not use it

  • Children under 12: not recommended
  • If hypersensitive (allergic) to this plant
  • Together with coumarin-type blood thinners, ciclosporin, tacrolimus, sirolimus, everolimus, HIV medicines (protease inhibitors, NRTIs) or certain cancer medicines (e.g. irinotecan, imatinib)
  • During pregnancy and breastfeeding (not recommended)

Cautions

  • If you take prescription medicines, ask a doctor or pharmacist before use.
  • May make hormonal contraceptives less reliable and cause bleeding between periods — use additional contraception.
  • With antidepressants (e.g. sertraline, paroxetine) or buspirone it may add to serotonergic effects (very rarely serotonin syndrome).
  • Before planned surgery tell your doctor you take it — it may need to be stopped (interactions with anaesthetics).
  • Avoid intense UV exposure (e.g. strong sun) during use.
  • If there are signs of skin infection, see a doctor.
Usage data: European Medicines Agency (EMA) monograph — Hyperici herba·Steeping time: EMA glossary on herbal teas

Home-made tincture · per the EMA

Tincture at home.

The EMA also lists a tincture. This is how to make it from dried herb from your bed.

Part usedAerial parts
Herb : alcohol ratio1 : 5e.g. 20 g per 100 ml
Alcohol50–70 %ethanol
Steep3 daysin the dark, at room temperature
Single dose1–1.5 ml3× a day · adults only
1

Weigh

20 g

of dried aerial parts, chopped

2

Cover with alcohol

100 ml

ethanol 50–70 %, in a glass jar

3

Leave to steep

3 days

close the jar, keep it in the dark and shake it now and then

4

Strain

into a dark bottle

press out the herb, label the bottle with name and date

5

Use

1–1.5 ml

3× a day · adults only

Before taking the tincture

The tincture contains alcohol. Read this before use:

  • Adults only
  • If hypersensitive (allergic) to this plant
  • Together with coumarin-type blood thinners, ciclosporin, tacrolimus, sirolimus, everolimus, HIV medicines (protease inhibitors, NRTIs) or certain cancer medicines (e.g. irinotecan, imatinib)
  • During pregnancy and breastfeeding (not recommended)
  • The tincture contains alcohol (ethanol).
  • If you take prescription medicines, ask a doctor or pharmacist before use.
  • May make hormonal contraceptives less reliable and cause bleeding between periods — use additional contraception.
  • With antidepressants (e.g. sertraline, paroxetine) or buspirone it may add to serotonergic effects (very rarely serotonin syndrome).
  • Before planned surgery tell your doctor you take it — it may need to be stopped (interactions with anaesthetics).
  • Avoid intense UV exposure (e.g. strong sun) during use.
  • Do not drive after taking it.

Good to know

How long

If symptoms last longer than 2 weeks or get worse, see a doctor.

What 1 : 5 means

1 g of dried aerial parts per 5 ml of alcohol — so 20 g per 100 ml.

Which alcohol

Ethanol 50–70 %. Ordinary shop-bought spirit (40 %) is weaker than the EMA states.

Source: European Medicines Agency (EMA) monograph — Hyperici herba · Steeping days and straining. Conversions (grams per 100 ml) are calculated by GridGarden from the ratio in the monograph. Cautions not in the monograph were added by GridGarden.

St John's wort in a raised bed: where to plant, size, pruning, winterGrowing
This is not medical advice. More
This is not medical advice. We only state traditional use as described in the monograph of the European Medicines Agency (EMA, HMPC committee). If you have health problems, are pregnant or breastfeeding, for children and when taking medicines, consult a doctor or pharmacist.
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