Alfalfa is a legume most commonly consumed as sprouts in salads and sandwiches, and sometimes used in herbal supplements. The Alfalfa marker on the 1019 IgG Food Antibodies – Bloodspot panel measures IgG antibodies directed against alfalfa proteins. IgG antibodies indicate immune recognition following exposure. They do not diagnose an IgE-mediated allergy and should not be interpreted as a standalone reason for permanent elimination.
Because alfalfa is not a daily staple for most individuals, detectable IgG levels may reflect either intermittent exposure or immune recognition in sensitive individuals. The clinical significance depends on whether symptoms consistently occur after consuming alfalfa or alfalfa-containing products and improve when they are removed from the diet.
Some individuals with elevated alfalfa IgG levels report delayed symptoms such as bloating, abdominal discomfort, fatigue, headaches, skin irritation, or joint discomfort. As a legume, alfalfa shares botanical similarities with foods like lentils and peanuts, though cross-reactivity patterns vary. Alfalfa sprouts have also occasionally been associated with digestive upset related to food handling or contamination rather than immune reactivity.
Alfalfa
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