Contraindications (Unit 5)

By 24th February 2022 May 11th, 2022 Master Herbalist Course

Master Herbalist Diploma: Unit 5: Contraindications

Learning outcome:

1. Understand why plants might be toxic and what tests can be used to determine toxicity

2. Justify why labelling is important

  • A non-exhaustive list of poisonous plants (for my own reference should I want to start using any of these creatively!)
    Alder buckthorn (Frangula alnus)
    Baneberry (Actaea spicata)
    Bittersweet (Solanum dulcamara)
    Black nightshade (Solanum nigrum)
    Buckthorn (Rhamnus cathartica)
    Bryony black (Tamus communis)
    Bryony white (Bryonia dioica)
    Buttercup family (Ranunculus)
    Columbine (Aquilegia vulgaris)
    Cowbane (Cicuta rirosa)
    Daphne (Daphne mezereum)
    Darnel rye grass (Lolium temulentum)
    Deadly nightshade (Atropa bella-donna)
    Dog’s mercury (Mercurialis perennis)
    Fool’s parsley (Aethusa cynapium)
    Foxglove (Digitalis purpurea)
    Fritillary (Fritillaria meleagris)
    Green hellebore (Helleborus viridis)
    Hemlock (Conium macula turn)
    Henbane (Hyoscyarnus niger)
    Ivy (Hedera helix)
    Laburnum — all varieties
    Lily-of-the-valley (Convallaria majalis)
    Meadow saffron (Colchicum autumnale)
    Mistletoe (Viscum album)
    Monkshood (Aconitum napellus)
    Privet (Ligustrum vulgare)
    Spindle tree (Euonymus europaeus)
    Spurges, all (Euphorbia)
    Spurge-laurel (Daphne laureola)
    Stinking hellebore (Helleborus foetidus)
    Thorn apple (Datura stramonium)
    Yew (Taxus baccata)
  • If in doubt about the safety of a particular essential oil, don’t use it – there will always be alternatives to the one you may have chosen.
  • Aromatherapy Organisations Council (AOC) is the self-regulatory board for aromatherapy in Britain.
  • A lot of what is written here is common sense… things like giving children a quarter amount of essential oil than you would an adult, and half the amount for an older person over 70
  • Label any mixes you make

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