Enhanced collagen synthesis and joint health
Critical component of collagen for healthy joints and cartilage
L-Proline
Non-essential amino acid crucial for collagen synthesis, wound healing, and joint health support
Scientific nameL-Proline
FormulaC5H9NO2
Molecular weight115.13 g/mol
CAS147-85-3
85
absorption score
8
safety / 10
25
USD per month
5
documented interactions
Check it against something
L-Proline with:
- Amylase
- Ashwagandha
- Avocado Oil
- BCAA (Branched-Chain Amino Acids)
- Beetroot Powder
- Beta-Alanine
- Bifidobacterium lactis
- Bifidobacterium longum
- Bovine Collagen
- Caffeine
- Calcium
- Calcium Bone Formula
- Calcium Carbonate
- Casein Protein
- Chicken Collagen
- Choline (Bitartrate)
- Chondroitin Sulfate
- Coconut Oil
- Collagen Peptides
- Comprehensive Immune Support Complex
- Comprehensive Multivitamin-Mineral Complex
- Creatine HCL
- Creatine Monohydrate
- D-Mannose
- DHA
- Electrolyte Blend
- EPA
- Fish Oil (EPA/DHA)
- Folate (5-MTHF)
- Ginger
- Iron Fumarate
- Iron Sulfate
- Joint Mobility Formula
- Keratin
- Krill Oil
- L-Carnitine
- L-Citrulline
- Lactase
- Lactobacillus acidophilus
- Lactobacillus rhamnosus
- Lipase
- Magnesium Citrate
- Magnesium Glycinate
- Magnesium Oxide
- Marine Collagen
- Melatonin
- Modafinil
- Olive Oil Extract
- Omega-3 + Curcumin + Vitamin D Triple Anti-Inflammatory Formula
- Papain
- Protease
- Saccharomyces boulardii
- Turmeric
- Vitamin B12 (Cyanocobalamin)
- Vitamin B12 (Methylcobalamin)
- Vitamin C (Ascorbic Acid)
- Vitamin C (Sodium Ascorbate)
- Vitamin D3
- Whey Protein
- Zinc Gluconate
Nothing found
82
out of 100
Works better together
Compatible. Timing differs, so follow each supplement's own window.
What it does
mechanism and evidence for each claimImproved skin elasticity and anti-aging
Supports skin structure, elasticity, and reduces wrinkles
Accelerated wound healing
Supports faster tissue repair and recovery
Enhanced cardiovascular health
Supports healthy blood vessel structure and function
Improved muscle recovery
Supports muscle tissue repair and recovery
Others take these for the same thing
Same goal, different mechanism — check any of them against this one
Calcium
Bone health & muscle function
1,000-1,200 mg
A
30%
Turmeric
Anti-inflammatory & antioxidant
300-1000mg
A
3%
Vitamin D3
Bone health & immune support
1000-2000 IU
A
85%
Collagen Peptides
Skin health & joint support
5-15g
B
85%
Calcium Carbonate
Affordable bone health & antacid
1000-1200 mg
A
25%
Phosphorus
Bone health & energy metabolism
700-1250mg
A
80%
Every pair we checked
12 combinations scored by the engine
L-Proline + Caffeine
No documented interaction either way
No known interaction
70
L-Proline + Creatine Monohydrate
No documented interaction either way
No known interaction
70
L-Proline + Calcium Carbonate
No documented interaction either way
No known interaction
70
L-Proline + Whey Protein
No documented interaction either way
No known interaction
70
L-Proline + Lactase
No documented interaction either way
No known interaction
70
L-Proline + Bovine Collagen
No documented interaction either way
No known interaction
70
L-Proline + DHA
No documented interaction either way
No known interaction
70
L-Proline + Turmeric
No documented interaction either way
No known interaction
70
L-Proline + Fish Oil (EPA/DHA)
No documented interaction either way
No known interaction
70
L-Proline + L-Lysine
Important for collagen cross-linking with proline
Works better together
78
L-Proline + Vitamin D3
Essential for proline hydroxylation and collagen synthesis
Works better together
82
L-Proline + Glycine
Other major collagen amino acid works synergistically
Works better together
82
Dosage
Daily1-3g
Collagen support1-3g daily
Wound healing2-5g daily
Joint health1-3g daily
Anti aging1-3g daily
Before you take it
VeganYes
When to expect it
First Effects2-4 weeks for joint and skin benefits
Peak Benefits8-16 weeks for sustained collagen and structural benefits
Deficiency DevelopmentMonths with inadequate synthesis or collagen demands
Toxicity OnsetVery rare, mainly digestive upset
How to measure it
MarkerPlasma proline levels or collagen synthesis markers
Optimal150-300 μmol/L
Deficient below<100 μmol/L
FrequencyOnly if monitoring collagen health or wound healing
What people actually reported to the FDA
CAERS, 1 reports naming it as the suspectMost reported effects
Named as the suspect
1 reports
of 2 that mention it at all
Serious outcome
100%
hospitalisation, emergency room or worse
Hospitalization1
Other Serious or Important Medical Event1
Reports are voluntary and unverified — they record what someone experienced while taking something, not what the compound caused. Counts skew towards products people take a lot of, and a serious outcome is more likely to be reported than a mild one, so these are not rates. How we filter them →
What actually reaches you
The label counts the carrier, your body does not
Absorption
Very high 85 of 100 · best absorbed form of this compound
Delivered daily
1700 mg
Cost per 100 mg delivered
$0.05 comparative — uses the absorption score, not a measured percentage
Works better with
+
Vitamin C
Essential for proline hydroxylation and collagen synthesis
Required cofactor for prolyl hydroxylase enzyme · level A
+
Glycine
Other major collagen amino acid works synergistically
Complete collagen amino acid profile · level A
+
Lysine
Important for collagen cross-linking with proline
Both amino acids essential for collagen structure · level BWhat not to take with L-Proline
!
High Protein Meals
Large protein meals may reduce proline absorption
Competition with other amino acids · mild significance
!
Alcohol
Alcohol may interfere with collagen synthesis
Impairs vitamin C utilization and collagen formation · moderate significanceMedication interactions
Discuss these with a pharmacist before combiningMay enhance collagen preservation
What to do: May be beneficial for collagen health
May enhance wound healing effects
What to do: May improve healing outcomes
Available forms
L-Proline (Free Form): Collagen support, Joint health, Wound healing, Well-tolerated
Food sources
Gelatin and collagen
1-3g per serving · 85
Bone broth
0.5-1.5g per cup · 80
Meat and poultry
0.8-1.2g per 100g · 75
Fish and seafood
0.6-1.0g per 100g · 75
Too little
- Poor collagen quality and joint problems
- Skin aging and reduced elasticity
- Slow wound healing and tissue repair
- Joint pain and cartilage deterioration
- Poor blood vessel integrity
- Connective tissue weakness
- Premature aging signs
Too much
- Generally well-tolerated:
- Mild digestive upset with large doses
- Potential amino acid imbalance
- Limited data on high-dose safety
Who benefits most
joint-health-arthritis
Essential for cartilage and joint collagen synthesis
1-3g daily
skin-anti-aging
Supports skin collagen and elasticity
1-3g daily
wound-healing-recovery
Essential for collagen synthesis during tissue repair
2-5g daily
athletes-injury-prevention
Supports connective tissue health and injury prevention
1-3g daily
aging-collagen-support
Helps maintain collagen production with aging
1-3g dailyWhere to buy it
Look for L-Proline at 1-3g per serving. The form that matters here is L-Proline (Free Form).
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What else affects it
Beyond other supplements
!
High protein meals
Large protein meals may reduce proline absorption
Competition with other amino acids
!
Alcohol
Alcohol may interfere with collagen synthesis
Impairs vitamin C utilization and collagen formationHow it works
- Essential component of collagen triple helix structure
- Provides structural stability to collagen through ring structure
- Often hydroxylated to hydroxyproline for collagen stability
- Important for elastin synthesis in skin and blood vessels
- Essential for wound healing and tissue repair processes
- Supports connective tissue formation and maintenance
Key findings
what the evidence supports- Essential component of collagen structure and synthesis
- Important for joint health and cartilage maintenance
- Supports skin health and anti-aging processes
- Generally safe but limited research on supplementation
Sources: NIH Examine.com · data reviewed 2026-08-02
Compiled by Denis, who maintains this database and holds no medical qualification — every figure here is sourced or derived, never asserted. How we calculate it →
Common questions
What are the benefits of L-Proline?
Documented effects: Enhanced collagen synthesis and joint health; Improved skin elasticity and anti-aging; Accelerated wound healing; Enhanced cardiovascular health. Critical component of collagen for healthy joints and cartilage
How much L-Proline should you take per day?
The common daily range is 1-3g. By goal — collagen support: 1-3g daily; wound healing: 2-5g daily; joint health: 1-3g daily; anti aging: 1-3g daily.
When is the best time to take L-Proline?
With food. First effects are typically reported within 2-4 weeks for joint and skin benefits.
What are the side effects of L-Proline?
At excessive doses: Generally well-tolerated:, Mild digestive upset with large doses, Potential amino acid imbalance, Limited data on high-dose safety. Safety rating at normal doses is 8 out of 10.
What should you not take with L-Proline?
Separate it from High Protein Meals, Alcohol by two to four hours. Large protein meals may reduce proline absorption
Does L-Proline interact with medications?
Documented interactions with collagenase-inhibitors, wound-healing-medications. Discuss these with a pharmacist before combining.
How do you know if you need L-Proline?
The marker is Plasma proline levels or collagen synthesis markers, optimal range 150-300 μmol/L. Common deficiency signs: Poor collagen quality and joint problems, Skin aging and reduced elasticity, Slow wound healing and tissue repair, Joint pain and cartilage deterioration.