St. John’s Wort

Traditionally, St. John’s Wort has been used primarily for supporting mood balance, especially when dealing with mild low mood or seasonal shifts in emotional wellbeing. It is commonly prepared as a tea, tincture, capsule, or infused oil.

Common Name: St. John’s Wort Latin Name: Hypericum perforatum (Latin name itself in italics) Alternate Names: Klamath Weed, Goatweed

• Parts used: aerial parts (leaves, flowers, buds)
• Primary properties: nervine, antidepressant (traditional), vulnerary
• Common preparations: tea, tincture, capsule, infused oil
• Best known for: supporting a balanced, brighter mood

Health Conditions St. John’s Wort Helps With

• Mild low mood — St. John’s Wort has one of the most well-established traditional and modern reputations of any herb for supporting mood balance, particularly mild seasonal low mood.
• Nerve-related discomfort — Traditionally used, often as an infused oil applied topically, to help soothe nerve-related pain and discomfort.
• Minor wounds & skin irritation — St. John’s Wort-infused oil has a long traditional history of topical use for soothing minor cuts, bruises, and skin irritation.
• Sleep difficulty tied to mood — Traditionally used to support more restful sleep when low mood or restlessness is a contributing factor.
• Menopausal mood changes — Traditionally used alongside other herbs to help ease mood fluctuations associated with menopause.

Compounds

• Hypericin — A key compound St. John’s Wort is named for and known by, generally understood to contribute significantly to its traditional mood-supportive reputation.
• Hyperforin — Another primary active compound, thought to play a central role in St. John’s Wort’s traditional and modern mood-support use.
• Flavonoids — Support St. John’s Wort’s overall antioxidant profile and contribute to its broader traditional anti-inflammatory reputation.
• Tannins — Present in the aerial parts, contributing a mild astringent quality relevant to its traditional topical, wound-supportive use.
• Volatile oils — Contribute to St. John’s Wort’s aroma and are thought to play a supporting role in its topical traditional applications.

Properties

• Nervine — St. John’s Wort’s most defining property, traditionally used to support a calm, balanced nervous system and mood.
• Antidepressant (traditional) — One of the herb’s most well-known and studied traditional uses, focused specifically on mild low mood support.
• Vulnerary — Its infused oil form has a long traditional history of supporting the healing of minor wounds and skin irritation.
• Anti-inflammatory — Supports St. John’s Wort’s broader traditional reputation for soothing irritated tissue, both internally and topically.

Recipes Using St. John’s Wort

• St. John’s Wort mood tea — A simple infusion of the dried flowering tops, traditionally sipped for mild mood support.
• St. John’s Wort infused oil — Fresh flowering tops infused into oil until it turns a distinctive red color, traditionally used topically for skin and nerve support.
• St. John’s Wort tincture blend — A concentrated liquid extract, sometimes combined with other nervines, for those wanting a more precise daily dose.

Products Featuring St. John’s Wort

• Standardized capsules — The most common and reliable form for mood support, offering a consistent dose of key marker compounds.
• Infused oil — The traditional topical form, valued for its distinctive red color and soothing skin and nerve applications.
• Tincture — Offers a concentrated liquid form for flexible, adjustable internal dosing.

Synergies

• St. John’s Wort + lemon balm — A calming pairing traditionally combined for mood and nervous system support.
• St. John’s Wort + lavender — Combined for broader mood and relaxation support.
• St. John’s Wort + comfrey — Paired in some traditional topical formulas for skin and tissue support.
• St. John’s Wort + oats (milky oat) — Traditionally combined to support and nourish the nervous system during periods of stress.

Safety & Precautions

St. John’s Wort is one of the herbs with the most significant and well-documented medication interactions of any commonly used botanical, so this section deserves particular attention. It is well known for inducing liver enzymes that speed up the metabolism of many medications, which can make those medications less effective; this includes birth control pills, blood thinners, certain antidepressants, immunosuppressants, and many other prescription drugs, so anyone taking any regular medication should consult a healthcare provider or pharmacist before starting St. John’s Wort.

St. John’s Wort can also increase skin sensitivity to sunlight (a reaction called photosensitivity), so those using it, particularly at higher doses, should be mindful of sun exposure and consider extra sun protection. It should not be combined with prescription antidepressants or other serotonin-affecting medications without medical supervision, due to the risk of a serious interaction called serotonin syndrome. St. John’s Wort is generally not recommended during pregnancy or breastfeeding due to limited safety data. It is also not appropriate for those with bipolar disorder without professional guidance, as it may contribute to manic episodes in susceptible individuals.

Because of its extensive interaction profile, St. John’s Wort should never be started or stopped without informing a healthcare provider, especially if any other medications are involved. For pets, St. John’s Wort is considered potentially toxic to dogs and cats, partly due to its photosensitizing compounds, and should be kept out of reach; any suspected ingestion should prompt a call to a veterinarian.

Q&A

Why does St. John’s Wort interact with so many medications?

St. John’s Wort has a notable effect on liver enzymes responsible for breaking down many medications, which causes those medications to be processed and cleared from the body faster than normal. This can reduce how effective certain medications are, which is why it has one of the more extensive interaction profiles of any commonly used herb.

Because of this, it’s genuinely important to check with a healthcare provider or pharmacist before starting St. John’s Wort if you take any regular medication, even ones that might not seem obviously related.

Can St. John’s Wort be used daily?

St. John’s Wort is commonly used daily for mood support, typically over a period of several weeks to notice its traditional effects, similar to how many mood-supportive herbs and supplements work gradually rather than immediately. It’s not generally considered a fast-acting, as-needed remedy.

Given its significant interaction profile, ongoing daily use should ideally be discussed with a healthcare provider, particularly if you’re also taking other medications or supplements.

Does St. John’s Wort make you more sensitive to the sun?

Yes — St. John’s Wort can increase skin sensitivity to sunlight in some people, a reaction known as photosensitivity, particularly at higher doses. This means skin exposed to strong sun while using St. John’s Wort may burn or react more easily than usual.

Using extra sun protection, such as sunscreen or protective clothing, is a reasonable precaution while using this herb, especially for those with fair or sensitive skin.

How long does it take to notice St. John’s Wort’s effects on mood?

Traditional and modern use of St. John’s Wort for mood support generally suggests it takes several weeks of consistent use to notice its full traditional effects, rather than providing an immediate shift. This gradual timeline is similar to many other mood-supportive interventions.

If mild low mood persists or worsens despite consistent use, it’s worth checking in with a healthcare provider rather than continuing to self-manage alone.

Is St. John’s Wort safe around pets?

No — St. John’s Wort is considered potentially toxic to dogs and cats, and its photosensitizing compounds can cause skin reactions in pets exposed to sunlight after contact, in addition to other possible symptoms from ingestion. It should be kept well out of reach in gardens and homes with pets.

If a pet ingests St. John’s Wort or shows signs of skin irritation after possible exposure, contacting a veterinarian promptly is important.

References

• Plants of the World Online: Hypericum perforatum
• PubMed: Scientific Literature on Hypericum perforatum
• National Library of Medicine: Chemical Constituents from Hypericum perforatum
• Wikipedia: Hypericum perforatum
• ScienceDirect Topics: Hypericum perforatum Research
• Memorial Sloan Kettering Cancer Center: About Herbs — St. John’s Wort
• PubMed: St. John’s Wort Drug Interaction Research
• PubMed: Hypericin and Hyperforin Compound Research