She’s helping those living the good life to live longer.

Dr. Amanda Kahn, an internist specializing in longevity, has become the “it girl” doctor for New York’s social set.

Notables such as actress Jenny Mollen and reality star-turned-wellness mogul Lo Bosworth pay $1,500 a month or $800 for a single visit to the concierge doctor.

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She does everything from prescribe Ozempic — often in trendy microdoses for those looking to increase energy and reduce joint pain — and administer buzzy NAD+ injections, which are purported to help with everything from jet lag to inflammation.

“I focus on anti-aging from the inside out, at a cellular level,’’ Kahn told The Post.

With her smooth skin and shiny hair, Kahn looks younger than her 36 years, making her something of a walking billboard for her practice.

But the native Upper East Sider — who went to tony Nightingale-Bamford, did her undergrad at Columbia University, and med school at New York Presbyterian-Weill Cornell — wasn’t always the picture of health.

While pregnant seven years ago, she developed preeclampsia, a potentially fatal complication characterized by high blood pressure, and a number of other serious issues.

“I had an auto immune condition on the severe end of the spectrum, where my liver started to fail,” said Kahn, whose husband is an eye doctor.

After giving birth to their son, she struggled with constant headaches, joint pain and losing the 60 pounds she gained while pregnant.

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