A Brief Introduction to L-Proline
Molecular Formula:C5H9NO2
Molecular Weight:115.13
CAS No.:147-85-3
Appearance:White crystalline powder
Regular commercial package: 25kg/drum
What is L-Proline?
L-Proline is a non-essential amino acid that can be synthesized by the human body, obtained through daily diet (meat, eggs, legumes, dairy products, etc.), and supplemented in powder, tablet, and capsule form. Because L-Proline is abundant in human protein, it’s important to ensure adequate daily L-Proline intake to meet protein synthesis needs. Vegetarians may experience L-Proline insufficiency, so supplementation is recommended to maintain a normal intake. Some patients may require rapid L-Proline supplementation via injections or infusions. In either case, it’s important to avoid excessive L-Proline supplementation.
Applications of L-Proline
Highassay adheres to strict quality control (QC) to produce L-Proline. Buy L-Proline in bulk from us now to get competitive market prices.
- Animal Feed
In addition to being added to fish bait, it is also added to the feed of various animals, increasing nutrition, accelerating growth, and boosting immunity.
- Plant Fertilizer
It increases soil nutrients, thereby improving fruit quality. It also helps plants withstand harsh conditions such as high and low temperatures.
- Skincare
Adding L-Proline to skincare products increases their nutritional content, making the skin appear firmer and plumper.
- Pharmaceuticals
Injected into the human body through injections or infusions, it provides a rapid protein supplement.
Benefits of L-Proline
- L-Proline is widely found in a variety of meat-based and other foods, and a variety of supplemental forms ensure we get the necessary L-Proline for our bodies.
- L-Proline has strong antioxidant properties, which not only directly boosts immunity but can also be added to skincare products to help slow aging.
- L-Proline is abundant in the human body and participates in protein synthesis, promotes cell growth, accelerates metabolism, improves skin condition, and maintains musculoskeletal health.
- L-Proline has a strong repairing effect on tooth enamel, making teeth stronger and healthier.
- In addition to its beneficial effects on the human body, L-Proline also plays a crucial role in the growth of plants and animals.
If you have any questions about processing L-Proline, Highassay’s R&D team is here to help.


About L-Proline
- L-Proline undergoes L-Hydroxylation within the peptide chain to form 4-hydroxyproline, a key component of animal collagen.
- L-Proline exists in a free form within plant proteins. As environmental stress increases, the L-Proline content in plants also increases, stimulating their stress resistance.
- L-Proline, when taken together with vitamin C, can accelerate collagen synthesis.
- Our company is a Chinese supplier of L-Proline raw materials, offering high-quality products at competitive prices.
Storage of L-Proline
- Sealed storage: This product isolates oxygen and moisture from the air, which can affect product quality.
- Dry storage: A humid environment can cause L-Proline to decompose and reduce its activity.
- Protect from light: L-Proline is light-sensitive, and direct sunlight can cause it to decompose and become ineffective.
- Well-ventilated: Store in a well-ventilated warehouse to prevent the accumulation of harmful substances.
- Avoid direct contact: Avoid direct contact of L-Proline with skin and eyes to prevent irritation.


Proline VS Lysine VS Glycine
Proline, lysine, and glycine all play key roles in protein synthesis. Taking a supplement that contains all three of these important amino acids will benefit your cells, bones, blood vessels, skin, and more.
Specification of L-Proline
L-Proline | CP2020 | EP11 | USP2023 | AJI92 |
Assay | ≥99.0% | 98.5-101.0% | 98.5-101.5% | 99.0-101.0% |
PH | 5.9-6.9 | / | / | 5.9-6.9 |
Specific rotation[a]D20 | -84.5°–86.0° | -84.0°–86.0° | / | -84.5°–86.0° |
Specific rotation[a]D25 | / | / | -84.3°–86.3° | / |
Transmittance(T430) | ≥98.0% | / | / | ≥98.0% |
Appearance of solution | / | clear & colorless | / | / |
Chloride(Cl) | ≤0.02% | ≤0.02% | ≤0.05% | ≤0.02% |
Ammonium(NH4) | ≤0.02% | ≤0.02% | / | ≤0.02% |
Sulfate(SO4) | ≤0.02% | ≤0.03% | ≤0.03% | ≤0.02% |
Iron(Fe) | ≤10PPM | ≤10PPM | ≤30PPM | ≤10PPM |
Heavy metals(Pb) | ≤10PPM | / | / | ≤10PPM |
Arsenic | ≤1PPM | / | / | ≤1PPM |
Other amino acids | ≤0.5% | / | Individual impurities≤0.5% Total impurities≤2.0% | Individual impurities≤0.5% Total impurities≤2.0% |
Ninhydrin-positive substances | / | Each impurity≤0.2% Total impurities≤0.5% | / | / |
Loss on drying | ≤0.30% | ≤0.50% | ≤0.4% | ≤0.30% |
Residue on ignition | ≤0.10% | ≤0.10% | ≤0.4% | ≤0.10% |
Endotoxin | <10EU/g | <10EU/g | <10EU/g | / |
Total plate count | ≤ 1000 CFU/g | ≤ 1000 CFU/g | ≤ 1000 CFU/g | ≤ 1000 CFU/g |
Moulds & Yeasts | ≤ 100 CFU/g | ≤ 100 CFU/g | ≤ 100 CFU/g | ≤ 100 CFU/g |