Developed by Dr. Dat Tran, MD, FAAAAI

Immunotherapy formulated by the allergist who practices it

OLLEREG is an at-home allergy immunotherapy spray developed by Dr. Dat Tran, MD, FAAAAI — a board-certified allergist/immunologist running 8 clinics in Houston. Same approach as allergy shots, delivered as a whole-mouth spray that reaches more of your mouth in one dose — not just the spot under your tongue. Two sprays, once a day, at home.

See How It Works ↓

allergen extracts · Backed by 30+ years of science · 90-day money-back guarantee · No insurance needed

Dr. Dat Tran, MD, FAAAAI

Board-Certified Allergist & Immunologist · Houston, TX

“Allergy shots work — I prescribe them every day. But most patients can’t commit to weekly clinic visits for three to five years. Sublingual drops fixed the compliance problem, but they pool under the tongue and only reach one patch of immune tissue. The inside of your mouth has five of them. OLLEREG is the first spray designed to reach all of them — same science, built around how the body is actually put together.”

FAAAAI Fellow NIH Trained Board Certified 15+ Years Practice

As Seen on Fox 26 Houston

Founder & Medical Director of Innovative Allergy — 6+ locations across Houston. 5.0 · 300+ Google Reviews.

Two Sprays. Once a Day. That's It.

Spray under your tongue, wait 5 minutes, and go about your day. No clinic appointments, no needles, no complicated routine.

Takes less than 60 seconds
Safe for ages 3 and up
Delivered to your door monthly
Track your progress in the OLLEREG portal

Find your match

Answer 4 Quick Questions

As Seen On Fox 26

Fox 26 Houston

~80%

of patients see meaningful relief

30+

years of OIT science worldwide

Compare Your Options

	RecommendedOLLEREG	OTC Medications	Allergy Shots
Treats root cause	✓	✗	✓
No clinic visits	✓	✓	✗
No needles	✓	✓	✗
Safe for ages 3+	✓	Varies	✗
Doctor-developed	✓	✗	Varies
Builds lasting tolerance	✓	✗	✓
Typical annual cost	From ~$300/yr	$200–360/yr	$1,500–4,000/yr

Real Patients. Real Results.

Clinically developed. Patient approved.

★★★★★

"My allergist was impressed with how much my symptoms improved. OLLEREG is doing what years of nasal sprays couldn't."

Before: Tried every OTC option. Allergy shots were too time-consuming with my schedule.

— Verified OLLEREG Patient

★★★★★

"As a nurse, I was skeptical of anything sold online. The FAAAAI credential and NIH training convinced me to try it. Glad I did."

Before: Skeptical of online allergy treatments. Needed clinical credibility before committing.

— Verified OLLEREG Patient

Frequently Asked Questions

Is OLLEREG real medicine or a supplement? +

OLLEREG is real immunotherapy, not a supplement. It uses FDA-regulated allergen extracts — the same ones allergists use for subcutaneous immunotherapy (allergy shots). Unlike antihistamines that mask symptoms, OLLEREG retrains your immune system at the source.

How is OLLEREG different from over-the-counter allergy medicine? +

OTC medications like Claritin, Zyrtec, and Flonase only block symptoms temporarily. When you stop taking them, the allergies come right back. OLLEREG is immunotherapy — it gradually changes how your immune system responds, building lasting tolerance over 3+ years.

Who developed OLLEREG? +

Dr. Dat Tran, MD, FAAAAI — a board-certified allergist and immunologist who completed advanced training at the National Institutes of Health. He founded Innovative Allergy in Houston, TX, and developed OLLEREG to make clinical-grade immunotherapy accessible to anyone, anywhere.

What if it doesn’t work? +

OLLEREG comes with a 90-day money-back guarantee. Use it consistently for 90 days, and if you’re not satisfied, we’ll refund you in full.

Trust the Science. Start Today.

Doctor-formulated. Clinically studied mechanism backed by 30+ years of published research. Delivered to your door.

Get Started — From $25/month

Learn more about OLLEREG →