Herb Safety

Herb Safety


Please note that the safety lists below refer only to the herbs sold on this website.  It may not be entirely complete.


When used safely & correctly, herbs are a valuable & effective home remedy, and in some cases, may have fewer side effects than some conventional medications. Never assume that because herbs are "natural," they are safe. Some herbs may be inappropriate for people with certain medical conditions. Some herbs may cause allergic reactions or interact with conventional drugs, and some are toxic if misused or at high doses.

Some are not meant for internal use at all!  If taking a herb for the first time, it is prudent to research it and if you are taking any medications, be sure there you check contraindications.  Using herbs for minor medical ailments is a great way to keep your family healthy naturally; however, if you have a severe medical condition, it is recommended that you seek the guidance of a qualified naturopath who can accurately diagnose your condition. 

A naturopath will also be able to take into account any other illnesses you may be suffering from; along with cross-checking any pharmaceuticals you may be taking against prescribed herbs.  A naturopath may prescribe herbal teas, tinctures, along with specialist nutrition & supplements as part of a wellness plan.  Some examples of contraindications from certain popular herbs are described below.

  • John's wort taken internally or used externally may cause your skin to be more sensitive to the sun's UV rays, and may cause an allergic reaction, stomach upset, fatigue, & restlessness. It’s been found that St. John's wort also interferes with the effectiveness of many drugs, including the blood thinner warfarin (Coumadin), protease inhibitors, birth control pills, certain asthma drugs, & many other medications. In addition, St. John's wort should not be taken with prescribed antidepressant medication. The FDA has issued a public health advisory concerning many of these interactions.
  • Valerian may cause sleepiness, and in some people, it may even have the unexpected effect of overstimulating instead of sedating.
  • Ginkgo, feverfew, and ginger may increase the risk of bleeding.


Prescription medications may interact with many herbs and cause unwanted or dangerous reactions. For example, there is a high degree of herb/drug interaction among patients who are under treatment for cancer. Be sure to consult your doctor before trying any herbal products.   Even some herbal remedies can be contra-indicated against each other, so if you are suffering from a severe illness and are self-prescribing, you need to be aware that more harm than good can come from trying “everything” at once. 

There are perhaps thousands of herbs available on the market.  Because it is for sale does not necessarily mean it is safe to use.   I cannot list all of the herbs that are not safe to use that are available in the world, so I will just talk about the range of herbs I have listed in this book.   The contraindications that are known at this time are as follow:


There are too many pharmaceuticals to mention particular cautions.  If you are prescribed pharmaceutics, please speak with your doctor or trusted health professional for warnings that may relate to you.


Comfrey leaf, Comfrey root, Arnica (never ever, and should never come in contact with your blood), Apricot Kernels.


If you have high blood pressure, do not use a herb that raises blood pressure. 

Visa-vis - Low blood pressure and related herbs.


Nettle when fresh or dried can cause a severe itch.  In tea form, there is no itch.


While St John’s wort is an excellent depression remedy; it should never be combined with pharmaceutical anti-depressants.


St John’s Wort


Herbs that stimulate the uterus muscles (including abortifacients, emmenagogues and strong laxatives) must be avoided during all stages of pregnancy; indeed, all herbs should be explicitly checked for safety if pregnant. The following herbs should be avoided during pregnancy;

Chaste Berry, Aloe Vera, Angelica Root, Aniseed, Ashwagandha, Basil, Blessed Thistle, Bladderwrack/Kelp, Buchu, Catnip/Catmint, Celery Seed, Cinnamon, Coltsfoot, Comfrey, Damiana, Fenugreek, Ginseng, Golden Seal, Gotu Kola, Juniper berries, Lemon Grass, Liquorice Root, Calendula,  Mugwort, Myrrh, Oregano, Parsley, Pau D'arco, Red Clover, Rhubarb Root, Rosemary, Sage, Schisandra Berry, Shepard’s Purse, St John’s Wort, Thyme,  Turmeric,

 Uva Ursi, Vervain, White Willow, Wormwood, Yarrow.


The following herbs should not be used by breastfeeding mothers.

Aloe Vera, Angelica Root, Basil, Bladderwrack/Kelp, Buchu, Catnip/Catmint, Cinnamon, Coltsfoot, Comfrey, Garlic, Golden Seal, Blessed Thistle, Juniper Berry, Liquorice, Myrrh, Sage, St John’s Wort, Thuja, Uva Ursi, White Willow Bark, Wormwood, Yarrow.