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L-Protein Bar
Sale price
$39.00
Regular price
$49.00
Meet our new L-Protein Bar—the only protein bar created by longevity scientists to nourish your muscles without accelerating aging. Support your future, not just your next workout. Longevity protein—designed for strength and healthy aging
Support strength without spiking aging factors
Support strength without spiking aging factors
Complete amino acid profile
Complete amino acid profile
Backed by 25 years of longevity science
Backed by 25 years of longevity science
Truly clean vegan protein: No GMOs, soy, artificial sweeteners, or artificial colors
Truly clean vegan protein: No GMOs, soy, artificial sweeteners, or artificial colors
HSA/FSA Eligible through Sika
Free shipping over $200
Why to add Fasting Shake to your day?
With Prolon, you get everything you need pre-packaged and ready to go. Each kit comes with five boxes which are labeled by day so you know what to eat each day.
Nutritional information and allergen warning
✓ Fat-focused weight loss
✓ Fat-focused weight loss
✓ Fat-focused weight loss
✓ Fat-focused weight loss
ADD THE ESSENTIALS:
"GREAT TASTING, DAILY FUEL" - JAMES R.
"FINALLY PROTEIN FOR AGING" - SARAH S.
"BACKED BY SCIENCE WE TRUST" - BETHANY B.
"GREAT TASTING, DAILY FUEL" - JAMES R.
"FINALLY PROTEIN FOR AGING" - SARAH S.
"BACKED BY SCIENCE WE TRUST" - BETHANY B.
We raised the bar on healthy protein
Protein is essential to life and to muscle protection and growth. But eating some kinds of protein can increase levels of pro-aging hormones like IGF-1—and many protein products contain additives that can compromise your health. The L-Protein Bar is different.
Formulated by the longevity scientists behind the Prolon 5-Day Fasting Mimicking Diet (FMD), this bar delivers the clean, complete plant-based protein that fuels your strength and vitality, without the elements that age you.
Built for longevity
Designed for longevity
Formulated to support muscle without accelerating aging
Uncompromisingly clean
Vegan, free of soy, gluten, dairy, GMOs, and added sugars
Complete protein
Vegan protein that rivals animal protein without the pro-aging downsides
Smart nutrition
High in fiber and iron, and designed to support healthy blood sugar levels.
Made with extra virgin olive oil
A heart-healthy fat shown to be associated with increased longevity
Based on 25 years of research
Formulated by the longevity scientists behind the 5-Day FMD
Don't age while you eat
You eat protein to be healthy. But many popular protein products may actually be accelerating aging. Here's how the L-Protein Bar compares.
PROLON
TYPICAL
Soy-free
Gluten-free
Dairy-free
Non GMO
No sugar alcohols
No artificial sweeteners
No artificial colors
Nothing to hide
Complete amino acid profile
Won't spike aging factors
Real chocolate
← Scroll horizontally to see comparison →
A smart way to fuel your day — and your life
Try it as a meal replacement, pre- or post-workout snack, part of a daily longevity diet, or anytime you want strength and energy without compromise.
Nutritional highlights (per bar):
14g Plant-based protein
170 Calories
Low glycemic formulation
High fiber + iron
No added sugars
Made with real chocolate, not palm oil
0,000+ Happy Healthy Customers
Loved by customers and longevity experts
"A game changer for healthy protein"
JESSICA S.
Verified Reviewer
"Perfect for my daily routine"
MICHAEL R.
Verified Reviewer
Why longevity protein?
Your muscle matters.
It doesn’t just shape your body; it can shape your life, playing a vital role in weight management, disease prevention, and overall well-being.
And starting around age 40, muscle naturally declines by 3–8% each decade, making quality protein essential for protecting lean mass.
Here’s the problem: no matter your age, most protein products that rely on animal sources like whey can accelerate aging. And they often contain hidden additives like silica and artificial flavors that don’t even have to appear on the label.
IGF-1: Balance is everything
Protein consumption affects your levels of a key hormone called insulin-like growth factor 1, or IGF-1. Eating too much of certain kinds of animal proteins (like those often found in many protein bars and powders) can spike IGF-1. Overstimulating IGF-1 can accelerate aging and increase disease risk. Too little protein intake can be just as harmful health-wise, and accelerate aging in its own right.
The key is balance—getting the optimal amount of protein from sources that support muscle without triggering this aging cascade. Based on our decades of research into nutrition, and our studies on optimal IGF-1 levels, we developed our longevity proteins to support muscle—without triggering pro-aging pathways.