Internal use — teas, tinctures, safety

Internal use is where efficacy rises and so does risk. A cup of chamomile tea is benign; a tincture of pennyroyal can kill you. The difference is dose, preparation, and the plant itself. You need to know all three.

Teas (infusions and decoctions) are the safest form. An infusion is leaves or flowers steeped in boiled water for 5–15 minutes, covered. A decoction is roots or bark simmered for 10–20 minutes. Infusions suit lemon balm, chamomile, peppermint, thyme. Decoctions suit valerian root, dandelion root, burdock. The general rule: 1–2 teaspoons dried herb per cup, or 1 tablespoon fresh. Steep covered to keep volatile oils in the liquid. Drink 2–3 cups daily for chronic conditions (anxiety, indigestion), or as needed for acute ones (coughs, nausea).

Tinctures are alcohol extractions. They are stronger, more shelf-stable, and dose more precisely than teas. The standard ratio is 1:5 (1g dried herb to 5ml alcohol). Use 40% ABV minimum — vodka works. Fill a jar one-fifth with dried herb, top up with alcohol, seal, and macerate for 2–4 weeks, shaking daily. Strain and bottle in dark glass. Dose is typically 2–5ml (half to one teaspoon) diluted in water, 2–3 times daily. Tinctures suit herbs that are unpalatable as tea (valerian, motherwort) or needed in controlled doses (hawthorn, passionflower).

Some herbs are dangerous. Pennyroyal, tansy, and rue all cause miscarriage and liver damage. Foxglove, monkshood, and hemlock are simply poisonous. Comfrey, as noted, destroys the liver. Kava kava (not a garden plant, but sold as a supplement) causes liver failure in some people. Even safe herbs interact with medication: St John's wort reduces the efficacy of the contraceptive pill, antidepressants, and warfarin. Do not guess. If you are on prescription medication, cross-check every herb.

The safest internal herbs are the ones that are also food. Lemon balm, chamomile, peppermint, ginger, fennel, nettle — these have been consumed in quantity for centuries with no population-level harm. Dandelion leaf and root are entirely edible. Elderflower and elderberry are traditional. These are your foundation. The stronger herbs — valerian, passionflower, hawthorn — require more respect. Use them short-term, at documented doses, and stop if anything feels wrong.