Zest Health Guide to Topical Aryl Hydrocarbon Receptor (AhR) Agonist

Managing psoriasis or eczema often means cycling through treatments, dealing with side effects, or worrying about what long-term steroid use might do to your skin. Vtama (tapinarof) works differently. It is a steroid-free cream that targets inflammation at the source, builds up your skin barrier, and offers something most topical treatments do not: the possibility of a real break from treatment once your skin clears.

This guide explains how Vtama works, how to use it, and what you can realistically expect.

What are Topical AhR Agonists?

AhR stands for Aryl Hydrocarbon Receptor. Vtama works by binding to AhR receptors in your skin. Think of these receptors as switches. When Vtama activates them, it triggers three things:

• Reduced inflammation. Vtama decreases the production of inflammatory proteins that cause redness, plaques, and itch.
• A stronger skin barrier. It helps increase filaggrin, a protein that is often depleted in eczema and psoriasis. Filaggrin helps your skin hold moisture and resist irritants. More filaggrin means more resilient skin.
• Less oxidative stress. Vtama activates pathways in your skin that reduce oxidative stress, a process that can drive inflammation and damage skin cells.

Vtama is currently the only FDA-approved topical AhR agonist. It is approved for plaque psoriasis in adults, and for atopic dermatitis, also called eczema, in adults and children 2 and older.

What Makes This Different

Vtama is steroid-free. It does not cause skin thinning or the rebound flares that can sometimes follow steroid use. That makes it suitable for long-term care, including on sensitive areas like the face, neck, armpits, and groin.

It can also be used on thicker, harder-to-treat areas like the elbows, knees, and trunk. Do not apply inside the eyes, mouth, or vagina.

How to Apply Your Medication

1. Apply a thin layer to affected areas once daily.
2. Try to apply at the same time each day. Bedtime works well for many people.
3. Wash your hands right after applying, unless you are treating your hands.
4. If you miss a dose, apply as soon as you remember. If it is almost time for your next dose, skip the missed one. Do not double up.

How Much to Use

We recommend using the Fingertip Unit (FTU) when you are getting started:

• This is the amount of cream squeezed from the tip of your finger to the first crease.
• 1 FTU covers about the size of the front and back of one adult hand.
• Precision: If you are treating a very small spot, adjust the amount accordingly.

Different body parts need different amounts. For smaller areas, use less. Your Zest provider can help you figure out the right amount for your specific areas.

Getting Started

Before starting, submit baseline photos of your skin for a severity assessment. No routine blood work is needed, but share all current and past medications with your provider. Provide previous treatment records if requested.

Expected Results

• Early results. Some people notice improvement within 4 weeks.
• Full effect. Maximum results are typically seen around 12 weeks. Many people reach clear or almost clear skin by this point.
• The remittive effect. Many people who reach clear skin can pause treatment and stay clear for an average of 4 months before needing to restart. That is a meaningful break, and a real sign of progress.

Consistency matters most in the early weeks. Even if progress feels slow, daily use is what builds results over time.

Safety and Side Effects

Most side effects are mild. Here is what to watch for:

• Folliculitis. Red, raised bumps or pimples around hair follicles. This is the most common side effect.
• Contact dermatitis. Redness, itching, or peeling at the application site.
• Headache. Reported by a small number of people.
• Cold symptoms. Such as a sore throat or runny nose.

If any side effect feels significant, or your skin is not improving as expected, reach out to your Zest care team. We want to hear from you.

Storing Your Medication

• Store at room temperature
• Keep tube or bottle tightly closed
• Keep out of reach of children
• Do not ingest medication
• Check expiration date before each use

When to Contact Your Zest Team 

• No improvement after 12 weeks of daily use for psoriasis, or 8 weeks for eczema
• Signs of a severe allergic reaction or infection
• Unusual worsening redness, pain, or swelling, or other ssigns of skin infection (pus, warmth, fever)

Have more questions? Contact your Zest care team by texting (865) 426-1746 or sending a message from your portal. You've got this, and we've got you.