Alpha-gal 101
A plain-language primer on alpha-gal syndrome (AGS).
Alpha-gal syndrome (AGS) is a 
tick‑associated allergy to a carbohydrate
called galactose-α-1,3-galactose (alpha-gal) found in most mammals. Many
people experience delayed reactions (often 3–6 hours) after eating mammalian
meat or products containing mammalian-derived ingredients.
This site provides educational information only and is not medical advice. If you suspect AGS, consult a board‑certified allergist.
Key points
- Reactions are often delayed 3–6 hours after mammalian foods.
- Tick bites are linked to sensitization to alpha‑gal.
- Work with a clinician to confirm diagnosis and plan management.
Educational only; not medical advice.
In this guide
- What causes AGS
- Common symptoms and timing
- How AGS is diagnosed
- Living with AGS and prevention