“Based on what I see for sale online, this has some of the highest quantity mgs of ingredients for the best possible price. Since my doc recommends this brand, I'm doubly sold.”
Prolon® L-Protein
A patented plant protein powder formulated to support muscle and healthy aging.
- Lower IGF-1 than whey or casein
- 3 plant sources, complete amino acids
- Ideal for longevity and recovery
- Delivers 25g of plant-based protein per serving
- Supports muscle repair and recovery
- Lower IGF-1 impact than whey or animal proteins
- Includes 21 vitamins and minerals
- Sourced from peas, black beans, and chickpeas
- Free from dairy, soy, and GMOs
- Supports healthy aging and longevity
- Convenient single-serving packets
Prolon® L-Protein
The science behind our ingredients
Prolon® L-Protein
Is this right for you?
Prolon® L-Protein
Is this right for you?
- 01You're focused on healthy aging and longevity
L-Protein is the only plant protein powder designed to support muscle without overactivating the IGF-1 pathway — making it the protein of choice for longevity diets.
- 02You want plant-based protein without compromise
Most plant protein powders rely on soy or pea isolate alone. L-Protein combines three complementary plant proteins with whole-food vitamins for a more complete formula.
- 03You're using or interested in fasting protocols
L-Protein was developed by Dr. Valter Longo, the researcher behind the Fasting Mimicking Diet — designed to fit into longevity and fasting nutrition plans.
- 04You want to support muscle without dairy or whey
Whey and dairy proteins can be inflammatory or hard to tolerate. L-Protein delivers 25g of clean plant protein per serving without dairy, soy, or GMOs.
01
You're focused on healthy aging and longevity
L-Protein is the only plant protein powder designed to support muscle without overactivating the IGF-1 pathway — making it the protein of choice for longevity diets.
02
You want plant-based protein without compromise
Most plant protein powders rely on soy or pea isolate alone. L-Protein combines three complementary plant proteins with whole-food vitamins for a more complete formula.
03
You're using or interested in fasting protocols
L-Protein was developed by Dr. Valter Longo, the researcher behind the Fasting Mimicking Diet — designed to fit into longevity and fasting nutrition plans.
04
You want to support muscle without dairy or whey
Whey and dairy proteins can be inflammatory or hard to tolerate. L-Protein delivers 25g of clean plant protein per serving without dairy, soy, or GMOs.
why we’re different
Not all supplements are created equal.
At Parsley, ‘professional grade’ means every supplement is third-party tested for quality and purity, and manufactured in NSF/USP-certified, cGMP-compliant U.S. facilities that meet FDA standards.
Our clinicians know which supplements actually move the needle — and which don't. Every formula is selected for clinical evidence, optimal bioavailability, and meaningful dosing. Not what's cheapest to manufacture. What actually works.
| Parsley Supplements | Standard Supplements | |
|---|---|---|
| Physician-Formulated | ||
| Third-Party Tested | ||
| Clinically Dosed | ||
| USA-Made | ||
| Most Bioavailable Forms |
Even mixed with just water, this protein powder tastes surprisingly good. It's a great plant-based food combination.
Lilli Link, MD
Doctor
CUSTOMER REVIEWS
Hundreds of 5-star reviews
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Fredda G.Verified Customer
Rebuild Clean Protein Powder
"My body started to crave this product. With battling malnourishment and malabsorption, this is a super helpful product to buy! Glad my doctor recommended it."
Mary K.W.Verified Customer
Supplement FAQ
Parsley physicians have treated over 50,000 patients using a root-cause, functional medicine approach. That depth of practice informs every ingredient we select, every dose we use, and every formula we craft. The result is a standard most supplement brands can't meet: physician-formulated, third-party tested for purity and potency, clinically dosed, and manufactured in NSF/USP-certified, cGMP-compliant U.S. facilities that meet FDA standards.
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