Wormwood (Artemisia absinthium)

How it works

Artemisia absinthium is rich in sesquiterpene lactones (notably absinthin and artabsin) and flavonoids that help modulate NF-κB activation and the release of TNF-α from immune cells. What makes wormwood remarkable is that researchers measured this directly in people: the Krebs trial tracked serum TNF-α and found it fell substantially in the wormwood group. Its intensely bitter compounds also stimulate digestive secretions, supporting appetite and digestion — the reason it has been prized as a digestive herb for centuries.

Traditional use

One of Europe’s oldest medicinal herbs, used since antiquity as a digestive bitter and to expel intestinal parasites. Germany’s Commission E recognised wormwood for loss of appetite and digestive complaints, and it remains a staple of European herbal practice.

Highlights

• In a double-blind, placebo-controlled study, 65% of people taking wormwood reached near-complete symptom remission by week 10 — while tapering their steroids — versus none on placebo.
• A second trial found symptom remission in 8 of 10 people taking wormwood, with Crohn’s activity scores falling from about 275 to below 175.
• The only botanical where researchers directly measured a drop in serum TNF-α in Crohn’s patients.
• Both studies used wormwood alongside existing therapy, supporting its role as a complementary option.
• Dose and preparation matter: quality, standardised products are important because of the herb’s natural thujone content.

What the research shows

Every study below links to its original publication so you can read it yourself. Many natural compounds have only been studied in small trials. That isn’t a verdict on them; it reflects how little funding exists for compounds that can’t be patented.

Using it alongside conventional care

Wormwood draws a lot of interest from people researching natural alternatives to Humira and Remicade, because it is one of very few herbs shown to lower TNF-α — the same inflammatory messenger those biologics target — in actual Crohn’s patients. The Omer 2007 study is especially notable for people hoping to reduce reliance on Prednisone: participants tapered their steroids under medical supervision while their symptoms continued to improve. Both studies were small, and wormwood was always added to existing care, so the right starting point is a conversation with your gastroenterologist about using it as a complementary layer and, where appropriate, a supervised steroid taper.

Never stop or change a prescribed medication without your gastroenterologist. Many people use natural support alongside conventional care, and your care team can help you do that safely.

Amounts used in research

Both trials used 750 mg of dried powdered herb three times daily (2,250 mg/day) for 6–10 weeks, as an addition to existing therapy.

Good to know

• Thujone is neurotoxic at high exposure and has been associated with seizures — dose and standardisation matter more here than for most herbs.
• Contraindicated in pregnancy and breastfeeding; historically used as an abortifacient.
• Avoid entirely if you have a seizure disorder or take medications that lower seizure threshold.
• Asteraceae family — cross-reactivity with ragweed, chrysanthemum and marigold allergy.
• The trials tapered steroids under physician supervision; stopping corticosteroids independently risks adrenal insufficiency and flare.

Community experiences

Sources

1. 1

   Steroid-sparing effect of wormwood (Artemisia absinthium) in Crohn’s disease: a double-blind placebo-controlled study

   Omer B, Krebs S, Omer H, Noor TO. · Phytomedicine · 2007 · PMID 17240130

2. 2

   Wormwood (Artemisia absinthium) suppresses tumour necrosis factor alpha and accelerates healing in patients with Crohn’s disease — a controlled clinical trial

   Krebs S, Omer TN, Omer B. · Phytomedicine · 2010 · PMID 19962291