What is Alpha-Gal Syndrome?

Alpha-Gal Syndrome (AGS) is an allergic condition triggered by the bite of a Lone Star tick. It causes allergic reactions to galactose-alpha-1,3-galactose (alpha-gal), a sugar molecule found in most mammals. Symptoms typically appear 3-6 hours after eating red meat, pork, or lamb, and can range from hives to life-threatening anaphylaxis. According to the CDC, over 450,000 Americans may have developed AGS since 2010.

What foods should Alpha-Gal patients avoid?

Alpha-Gal patients must avoid all mammalian meat including beef, pork, lamb, venison, and bison. Many also react to mammalian by-products like gelatin (found in gummy vitamins and gel capsules), dairy products, and ingredients derived from mammals such as lard, tallow, and carrageenan. Safe alternatives include poultry (chicken, turkey, duck), fish, seafood, eggs, and all plant-based foods.

What medications are safe for Alpha-Gal Syndrome?

Many medications contain hidden mammalian ingredients. Gel capsules and softgels often contain bovine or porcine gelatin. Safe alternatives include tablets, caplets, liquids, and capsules made with vegetable-based HPMC. Always check inactive ingredients for gelatin, magnesium stearate (usually plant-derived in US), lactose, and stearic acid. VectorShield helps patients identify safe medication alternatives.

What are the 4 sensitivity levels of Alpha-Gal Syndrome?

Alpha-Gal sensitivity varies by patient: Level 1 (Mild, ~40%) - react only to mammalian meat; Level 2 (Moderate, ~30%) - also react to gelatin products; Level 3 (Significant, ~20%) - also react to dairy products; Level 4 (Severe, ~10%) - react to trace amounts and cross-contamination, sometimes called 'super reactors'. Sensitivity can change over time, especially with additional tick bites.

Can Alpha-Gal Syndrome be cured?

There is currently no cure for Alpha-Gal Syndrome, but many patients see improvement over time if they avoid additional tick bites. Some patients report tolerance returning after 1-5 years of strict avoidance and no new tick exposures. However, a single new tick bite can restart or worsen the condition. Management focuses on strict avoidance of trigger foods and carrying emergency medication like epinephrine.

Experimental research — in development. This is not a shipping feature and is not currently available. VectorShield is not a medical device and does not diagnose, detect, or predict allergic reactions. If you feel unwell, contact your healthcare provider.

Experimental · Research

Could vitals help spot delayed reactions?

Alpha-Gal reactions can be delayed by hours. We're researching whether vital-sign trends from Apple Health could one day add a complementary, observational signal — never a replacement for avoidance or medical care. We're holding it back until it meets a bar we trust, and we'll always describe it honestly.

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The science

Reactions arrive late — often while you sleep.

Unlike a typical food allergy, Alpha-Gal reactions usually appear 3 to 6 hours after eating — so a dinner reaction can hit at 2–4 AM. That delay is exactly what makes them easy to miss and hard to connect back to a meal.

Our research asks a simple question: in that quiet window, do your own vital-sign trends shift in ways worth noticing? If we can learn to read that pattern responsibly, it could give you and your allergist one more honest data point.

Conceptual illustration of the science — not real user data, and not a screenshot of the app.

The approach

Passive, and honest about its limits.

Read what you already track

Heart rate, HRV, and temperature trends from Apple Health — no extra hardware.

Anchor to a meal

Trends are considered in the hours after a logged meal, when delayed reactions tend to surface.

Surface patterns, not verdicts

The aim is to help you and your allergist see your individual pattern — never to make a call for you.

Why it's not shipping yet

Turning noisy wearable data into something dependable is hard, and a health tool that cries wolf is worse than none at all. Until we can stand behind the accuracy, this stays in research. VectorShield's shipping features — medication safety, safe restaurants, and community — don't depend on it. We'll bring you along as it earns its place.

See our research and sources