Laura Modi

So when the check engine light comes on in your car, do you ignore it?

Of course not.

You take it to the mechanic and fix it before it's a bigger problem.

Your body is no different.

It's constantly sending signals.

Inflammation, blood sugar is rising, hormones are shifting.

But if you don't look under the hood, you won't know what needs attention.

And that's where function comes in.

It's your body's personal dashboard.

It's designed by doctors, including me, and it's trusted by leading physicians and hundreds of thousands of members.

With the 100 most critical lab tests covering every major system, from heart to liver to kidneys to metabolism to hormones, toxins, nutrients, and more, you can get real numbers, real data, so you can take action and make improvements and track them over time.

And that's how you prevent disease instead of just treating it.

So check your system, start testing.

Go to function.com slash mark, and if you're one of the first 1,000 people this week,

Use the code MARK2026 for a $50 credit toward your $365 membership.

It's time to stop guessing.

Start testing with function.

This time of year can be overwhelming.

With holidays, work deadlines, even the shorter days can take a toll on your body and mind.

That's where sunlight can come in.