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41 clinical trials · HSA/FSA Eligible

Better skin starts from within

Serums, lasers, needles — they work at the surface. The Prolon 5-Day Fasting Mimicking Diet supports cellular rejuvenation through autophagy, with a clinically shown 25% increase in skin hydration after one cycle.

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★★★★★

4.4 Stars

41 clinical trials

Trusted by 1M+ users

Clinically Supported Results

25%

increase in skin hydration after one cycle

2.5 years

Biological age reduction after three consecutive monthly cycles

clinical trials behind the science

1M+

users who trust Prolon

TLDR: Most skincare stops at the surface. Prolon works from within, with a published clinical study showing a 25% increase in skin hydration after one cycle.Here are 5 reasons this is skincare no serum can touch.

Clinically studied skin results that go deeper than any serum

Every skincare product works on the surface. Prolon has a published clinical study showing what happens when you address skin at the cellular level. In a clinical study, skin hydration rose 25.1% five days after the first Prolon cycle, compared with 8.52% in a control group. After three consecutive monthly cycles, participants reported better skin texture and more even skin tone.Even after 71 days, hydration remained significantly higher. These aren't topical results. They're cellular.

Your skin is the only organ that shows you the results

Here's a line worth repeating: your skin is the only large organ you can actually see. Every other benefit of cellular renewal, including metabolic reset, has to be measured with blood work and scans. Your skin is the one place where the body gives you a visible progress report. When Prolon visibly improves it after three consecutive monthly cycles, you're seeing proof of what's happening at the deepest level.

A woman in a brown athletic jacket smiles and waves while standing in front of bamboo trees.

Real food, every day of the fast

Without real food, your body pulls resources away from non-essential systems — and skin is first on the chopping block. Prolon is precision nutrition — designed to keep your body in a fasting state while you eat. Every day, your body gets plant-based soups, nut bars, olives, kale crackers, and herbal teas. Real food, real nutrition. You're nourishing your skin while your body still enters a fasted state at the cellular level.

A person holds a spoon over a bowl of yellow soup at a set table.

The cellular renewal behind the glow

By day three, your cells enter a state called autophagy — where old, damaged cell components get cleared out and recycled. The Prolon 5-Day FMD is the only nutrition program clinically proven to trigger autophagy in humans. In the skin, that means damaged cells clearing faster, the cells that build collagen functioning the way they're supposed to, and the whole system running cleaner.

A smiling woman in a kitchen holds a partially unwrapped nutrition bar, about to take a bite.

25 years of research from USC. Not a skincare trend.

Another collagen powder. Another glow serum. Another "protocol" that'll be forgotten by next quarter. None of them have a published study, and most of them won't last. L-Nutra's founder Dr. Valter Longo developed the FMD at the Longevity Institute at USC: 25 years of research, 41 clinical trials, research collaborators including Stanford and Mayo Clinic, 200+ issued or pending patents. Prolon is the first and only patented nutrition program to support longevity through cellular rejuvenation. When something this well-studied produces a visible skin result, it's not a trend. It's biology.

A collection of colorful numbered product boxes arranged on a wooden surface against a white tiled wall.

Results that hold long after the five days are done

One of the most common questions about the 5-Day program: does it actually last? In the published study, the skin improvements were measured again 71 days after the program ended, and the benefits remained significant. Five days, weeks of visible payoff. The recommended protocol is 3 onboarding cycles over 3 consecutive months, then 3 to 4 cycles a year.

Your skin shows you the renewal first

Your skin is the only large organ you actually see. The cellular renewal Prolon is designed to support happens mostly out of view, measured in lab tests and bloodwork. Your skin is the part you can actually watch. The bigger insight: when your skin looks renewed after three cycles, that's a visible sign of the cellular renewal the 5-Day program is built to support. You see it on your skin first.

Skincare that starts from within. Clinically shown 25% increase in skin hydration after one cycle.

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What happens inside your body

Five days. Five phases. Here's the transformation happening at the cellular level.

Transition to fasting state

Feels like a normal day with less on the plate. Your body begins depleting glucose stores and switching fuel sources.

Fat-focused weight loss begins (ketosis)

Glucose stores are depleted. Your body shifts to using fat for fuel. You're now producing ketones — a clean, efficient energy source.

Autophagy activates

Your cells begin cleaning house — recycling damaged components and generating fresh, healthy ones. This is clinically verified, not theoretical.

Cellular rejuvenation

Autophagy is in full swing, and your cells are functioning as younger versions of themselves. This is when many users report peak mental clarity.

Deep renewal and reset

Cellular clean-up and renewal at its peak. Your body has undergone a measurable reset — supporting healthy aging, metabolic health, and the kind of renewal that shows up on your skin over the following weeks.

The glow is real

Verified quotes from Prolon customers who finished three cycles.

★★★★★

"I experience great sustained energy, better-looking skin, better sleep, and a sense of achievement every time I complete the five days. As a scientist myself, the work and science behind the program drove me to try it."

Liz

Verified user · scientist

★★★★★

"A radical game changer. Every time I do it, I feel 100% better. Clears up low energy, blurry vision, mental fuzziness, body aches and pains, and skin issues."

Cecile

Verified user · repeat customer

★★★★★

"I lost weight, my energy level peaked to a point where I feel 20 years younger. I feel like I can be me again and I can have the energy to play with my kids. I've never done another program of any kind that gave me such relief."

Jennifer

Verified user