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.

Our story

Built by a patient, for patients.

VectorShield exists because of a near-death experience, and a wife who kept looking for answers after the doctors stopped.

The day everything changed

It was a typical day in Northeast Arkansas. I was helping my dad put up fences on his new property, the kind of work you don't think twice about in rural America.

When I got home, I found six ticks latched onto my left leg. Despite bug spray, they'd found their way through. I removed them and didn't think much of it.

The worst came after a steak dinner with an old friend. What should have been a great evening became the scariest night of my life.

I ended up in the emergency room, pumped full of antihistamines, fighting off anaphylaxis, almost passing out on the bathroom floor. And no one could tell me why.

My wife found the answer

While I was still recovering, my wife started researching. Hours on forums, late-night searches. She connected the dots the professionals had missed: ticks, meat, delayed reactions.

Alpha-Gal Syndrome. A tick bite makes your body react to a sugar found in mammalian meat, hours after eating. That delay is why no one tied my dinner to the ER.

My wife diagnosed me before my doctor did. We had to request the blood test ourselves, and it confirmed exactly what she already knew.

Living with Alpha-Gal is exhausting

Avoiding steak is the easy part. It hides everywhere. Gelatin capsules, beef-derived candy, animal-sourced collagen. Every day means:

Reading every ingredient label at the grocery store
Calling restaurants ahead to ask about cooking oils
Researching every medication before taking it
Living in constant fear of another reaction

We needed a system. So I built it.

The system I wish existed

Turn the exhausting parts into a few taps.

Check whether a medication hides mammalian ingredients. Find restaurants with real cooking-fat data. Log meals and reactions, and lean on a community that gets it. We are also researching whether wearable trends could one day add an early signal. That work is not in the app yet.

See what we're researching next

Alpha-Gal by the numbers

450K+

Estimated US cases

Suspected undiagnosed

20%

Annual growth

Countries affected

Sources: CDC Alpha-Gal Syndrome surveillance data, Commins et al. clinical studies.

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Whether you have Alpha-Gal, know someone who does, or want to help build the tool they need, get in touch.

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