St John’s wort is the most studied and most prescribed medicinal herb for nervous tension, inner frustration, and treatment of mild to moderate depression.
St John’s wort comes from the Clusiaceae family.[1] Medicinal properties of St John’s wort have been used since ancient Greece as part of traditional Greek medicine.[2]
Other names
Botanical name: Hypericum perforatum
Common names: Hypericum, Amber, Touch-and-heal, Demon chaser, Tipton Weed, Witches’ herb.
English: Rosin rose, Witches’ herb, St John’s grass, Terrestrial sun, Goatweed, Klamath weed, Tipton weed.
French: Millepertuis, Herbe de St-Jean, Chasse-diable, Herbe aux piqures.
Characteristics
St John’s wort is perennial herb that grows up to one meter high and flowers from mid-summer to autumn.[1] It is native to Europe, North Africa, North America, and Western Asia [5]
St John’s wort prefers sunny open spaces but can grow in any weather conditions except very dry. It is aromatic and tastes bitter and acrid.[5]
St John’s wort has small oval or elliptical dark green leaves and corolla (8-20 mm diameter) with several golden yellow petals.[6]
The underside of the flowers have a slight red colour and many black glands that are a source of the main constituent hypericin.[1] Seeds are 0.8-1.3 mm long, cylindrical, brown.[6]
St John's wort flower. Source: Zhara @ Pexels
Five of many active constituents responsible for St John’s wort’s actions include:
Naphtodianthrones (hypericin)
Phloroglucinols (hyperforin)
Flavonoids (rutin, quercetin)
Volatile oil
Tannins
Historically, research have shown that the main active constituents responsible for the management of nervous system disorders were hypericin and pseudo hypericin.[7]
Other St John’s wort constituents that have a potentially antidepressant action include hyperforin, rutin, and quercetin.[8]
Use
For centuries the aerial parts of the plant have been used during flowering as herbal medicine for external and internal ailments.
Traditional Use
St John’s wort has a long history of use starting in ancient Greece where it was recommended by physicians like Galen and Hippocrates for:
wound healing
diuretic properties
menstrual disorders
intestinal worms[5]
Throughout history St John’s wort was applied by many healers for its magical and ritualistic uses.[3] People from ancient Greece to the Middle Ages believed that St John’s wort has magical power against evil spirits.
In the 16th century, herbalist Paracelus and Culpeper were using St John’s wort to treat wounds, reduce pain, depression, low mood and over excitation.[3]
In the 18th and 19th century in Europe, teas and tinctures of St John’s wort were used for treatment of gastritis, anxiety and depression.[1]
Medicinal Use
St John’s wort is used for the nervous system, specifically for treating depression (uplifting), anxiety (grounding), neurosis and chronic nervous exhaustion, sciatica, neuralgia.[3]
St John’s wort is also used for the musculoskeletal system as a relaxant.
Chronic pain in conditions like fibromyalgia, shingles, sciatica, rheumatoid arthritis, and period cramps is alleviated with the use of St John’s wort.[1]
Externally, St John’s wort is used for wounds, burns, ulcers.[9]
St John’s wort was approved by the German commission E as a main internal treatment for mild to moderate depression, anxiety and nervous restlessness in Germany and Austria in 1998.[1,9]
As topical treatment, St John’s wort oil was also approved by German Commission E for treatment of injuries, myalgia, and first-degree burns.
Nutritional facts
St John’s wort dried flowers and leaves are used to make tea. Flowers and leaves can be used as edible garnish in salads.
St John’s wort contains high amounts of:
potassium
phosphorus
iron
magnesium
calcium
sodium
vitamin C
and trace amounts of:
manganese
zinc
copper
vitamin E
B complex
vitamin D[10]
It also contains antioxidants iso-quercitrin, quercitrin, phenolic acid and chlorogenic acid that helps insulin regulation.[10]
Health benefits
St John’s wort has been used for many health conditions with a large body of research and clinical evidence supporting its use in the treatment of depression.
St John’s wort and depression
St John’s wort is mostly known as a natural alternative for pharmaceutical antidepressants.
Considering that antidepressant medications have a range of side effects, holistic practitioners and some orthodox medical practitioners recommend St John’s wort for depression management.
The conclusion of many studies demonstrated that re-uptake of neurotransmitters dopamine, serotonin, nor-adrenalin, and GABA are responsible for St John’s wort antidepressant action.[11,12]
St John’s wort inhibits serotonin reuptake not in the same way as SSRI antidepressant medications via serotonin transporter, but by increasing intracellular sodium concentration.[13,14]
Cochrane meta-analysis demonstrated that St John’s wort was better than placebo and has the same effectiveness as standard antidepressant medications.[15,16]
Change in mean total HAM-D (Hamilton Rating Scale for Depression) score in patients suffering a major depressive episode over the 6-week treatment with Hypericum perforatum (St. John's wort) extract or placebo.
Source: Kasper, S., et al. Superior efficacy of St John's wort extract WS®5570 compared to placebo in patients with major depression: a randomized, double-blind, placebo-controlled, multi-center trial. (2006)
Thirty-seven double-blind, randomised studies including 4925 participants, using mono preparations of St John’s wort over at least 4 weeks improved symptoms of mild to moderate depression and had the same effects as synthetic antidepressants in adults.[17]
A randomised double blind, double dummy (use of two different placebos) study was undertaken on 251 adult patients with major depression to compare the efficiency of St John’s wort extract WS 5570 with paroxetine — SSRI antidepressant medication.[18]
The outcome demonstrated that for treatment of moderate to severe depression St John’s wort extract is better tolerated and at least as effective as paroxetine.[18]
Linde et al. (2018) concluded that St John’s wort extracts are:
superior to placebo in patients with major depression
similarly effective as standard antidepressants
with fewer side effects than standard antidepressants
For treatment of severe depression St John’s wort extract was in some cases not as effective as pharmaceutical antidepressants.[17,18,19,20,21]
Therefore, recommendation in severe depression cases is not to rely only on St John’s wort treatment.
Therapeutic dosage
St John’s wort can be used in:
juice
infusion
tincture
ointment
compresses
wash
infused oils
The safe dosage include
Infusion of dried herb: 2-4 g, three times a day
Fluid extract (25%): 2-4 ml, three times a day
Tincture (1:10, 45%): 2-4 ml, three times a day[1,2,4,9]
The clinical trials on depression were based on standardised extract with daily 300-1200 mg. The majority used 900 mg daily.
St John’s wort oil is made by steeping the flower heads in vegetable oil and exposing them to sunlight for 6 weeks.
Safety concerns
St John’s wort has very low toxicity.[4]
St John’s wort’s side effects are minor compared to side effects of antidepressant medications.
St John’s wort potential side effects may include:
gastrointestinal symptoms (dyspepsia, diarrhoea, nausea, vomiting, constipation)
skin conditions (rash, itch, sensitivity to light)
fatigue
restlessness
acute neuropathy
sexual dysfunction
dizziness[1,33]
St John’s wort has the potential to interact with other medications.[1] Minor side effects are estimated to occur in 1-3% of users.
The phototoxic rash associated with St John’s wort which causes erythema, itch and heightened sensory nerve sensation has been well documented and is referred to as “hypericism”.[1,4]
It is recommended to avoid strong sunlight and UV light when using St John’s wort.
However, it was demonstrated that photosensitivity can occur in some patients who take high doses of St John’s wort (900mg or more once per day).[9,34]
A therapeutic dose of 2.7 mg/day of St John’s wort is about 50 times lower than the level that might induce phototoxicity.[9,35]
There are no reports of St John’s wort side effects on infants during breastfeeding, however more long-term studies are required.[4,36,37]
Possible interactions with medications
Reports of interactions exist for St John’s wort and the following pharmaceutical medications:
Psychoactive drugs: amitriptyline, quazepam, methadone, alprazolam
SSRI (sertraline, paroxetine, nefazodone) possibly leading to serotonin syndrome (increased levels of serotonin)
Benzodiazepines (Xanax and alprazolam) – increasing its clearance by two-fold
Contraceptive pills (St John’s wort can decrease norethindrone and ethinyl estradiol levels by 13% to 15%, resulting in breakthrough bleeding, irregular menstrual bleeding, or unplanned pregnancy)
Antifungal (voriconazole)
Cancer medications: imatinib and irinotecan
Cardiovascular medications: digoxin, warfarin, phenprocoumon, simvastatin, and verapamil
Gastrointestinal medications: omeprazole
HIV medications: indinavir and nevirapine
Immunosuppressants: cyclosporine, tacrolimus
Respiratory medications: theophylline, fexofenadine
Concurrent administration of high doses of St John’s wort is contraindicated with the following drugs: blood thinning medications such as warfarin.[7,38,39,40,41]
St John’s wort is one rare herbal medicine that has been assessed in many controlled studies to establish interaction with pharmaceutical drugs.[42]
St John’s wort has been shown to affect drug metabolism in two ways, increasing effectiveness or decreasing and cancelling the effects of the drug.[43] This increase may be helpful to the patient or may increase the effects to toxic levels.
There are two mechanism pathways that St John’s wort extract affects drug metabolism. The first is through the cytochrome P450 that alters metabolism, and the second way is through P-glycoprotein a membrane protein that affects drug absorption and efflux.[42,43]
Any level of interaction will depend on the type of preparation used, dosing regimen, route of administration and length of exposure to the herb.[1,3,4] Therefore, it may cause variable effects for any drug/herb interaction.
Possible interactions with herbs and supplements
St John’s Wort may reduce iron absorption.[44]
Combining St John’s wort with L-tryptophan and 5-hydroxytrypthophan (5-HTP) due to increased serotonin might increase the risk of serotonin syndrome.
Serotonin syndrome is built up of the neurotransmitter serotonin in the body that can cause symptoms including agitation, hallucination, tachycardia, hyperthermia incoordination, nausea, vomiting and diarrhoea.[9]
There is a case report of serotonin syndrome in a patient who took tryptophan and high doses of St. John’s wort.[9,40]
There are no known interactions between St. John’s wort and food.[9]
Follow the link to D'Connect website to read full article: https://dconnect.co.nz/st-johns-wort/
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