Active Pharmaceutical Ingredients
What is Bulk L Theanine Powder?
Bulk L-theanine powder means a product containing L-theanine (g-N-ethyl-L-glutamine) as the only active ingredient. It is sold directly without additional processing such as capsules, tablets or chewable gum. It usually appears as a white or white crystalline powder and is easily dissolved in water.
COA
| Items | Limits | Test results |
| Description | White to yellowwish White crystals or crystalline powder | Conforms |
| Solution clarity | Clear and colorless | Clear and colorless |
| Melting point | 202.0~215.0°C | 210.8~211.5°C |
| Assay | 98.0～102.0% | 100.3 |
| Specific Rotation | ﹢7.5° - ﹢8.5° | 7.9° |
| PH | 4.5-6.0 | 5.4 |
| Loss on drying | ≤1.0% | 0. 1 |
| Residue on ignition | ≤0.20% | 0. 1 |
| Chloride | ≤0.02% | ＜0.02% |
| Sulfate | ≤0.02% | ＜0.02% |
| Particle size | 90% through 0. 18mm mesh | Conform |
| Heavy metals | ≤10ppm | ＜10ppm |
| Iron（Fe） | ≤30ppm | ＜30ppm |
| Arsenic(As) | ≤2ppm | ＜2ppm |
| Mercury(Hg) | ≤0. 1ppm | ＜0. 1ppm |
| Cadmium | ≤1ppm | ＜1ppm |
| Total Plate Count | ≤1000CFU/g | ＜1000CFU/g |
| Yeast and Molds | ≤100 CFU/g | ＜100 CFU/g |
| Coliforms | Negative | Negative |
| Salmonella | Negative in 25g | Conformsconform |
What is the most effective form of L-theanine?
There are three types of commercially available L-theanine:
Natural green tea extract (typically containing 20%-60% theanine, the rest being polyphenols and caffeine);
pure L-theanine synthesized by bioenzymatic methods (98%-99% content);
Privately labeled diamonds (extracted by special smelting, ≥99% purity and containing only L-shapes).
Studies have shown that pure L-theanine reaches its maximum plasma concentration 30–50 minutes after oral administration, which is approximately 70%. Therefore, there was no significant difference in the homogeneity level when the label explicitly stated “L-shaped” and the purity was ≥98%. In other words, the “dose” and “route of administration” determine the true effect, not the brand premium.
Natural green tea extract (typically containing 20%-60% theanine, the rest being polyphenols and caffeine);
pure L-theanine synthesized by bioenzymatic methods (98%-99% content);
Privately labeled diamonds (extracted by special smelting, ≥99% purity and containing only L-shapes).
Studies have shown that pure L-theanine reaches its maximum plasma concentration 30–50 minutes after oral administration, which is approximately 70%. Therefore, there was no significant difference in the homogeneity level when the label explicitly stated “L-shaped” and the purity was ≥98%. In other words, the “dose” and “route of administration” determine the true effect, not the brand premium.
Which product contains the highest amount of L-theanine?
*Pure theanine tablets: 200 mg per tablet, 10-20 mg of excipients;
*A healthy drink: 50-200 mg per bottle, but high in sugar and sugar;
*Matcha powder: 20-40 mg per gram of dry matter, contains caffeine and catechins.
In fact, the 99% bulk L-theanine powder wins because of its very low concentration, which is especially suitable for those who require high doses (e.g., 400 mg/time) or long-term use.
*A healthy drink: 50-200 mg per bottle, but high in sugar and sugar;
*Matcha powder: 20-40 mg per gram of dry matter, contains caffeine and catechins.
In fact, the 99% bulk L-theanine powder wins because of its very low concentration, which is especially suitable for those who require high doses (e.g., 400 mg/time) or long-term use.
How to buy L-theanine powder?
Sost Biotech offers high-quality L-theanine powder (98%) and supports OEM custom production, offering a comprehensive service from samples to large quantities.
For more information, please contact us by email.
Email:ericyang@xasost.com
Email:ericyang@xasost.com
Product Data Sheets
| Items | Limits | Test results |
| Description | White to yellowwish White crystals or crystalline powder | Conforms |
| Solution clarity | Clear and colorless | Clear and colorless |
| Melting point | 202.0~215.0°C | 210.8~211.5°C |
| Assay | 98.0～102.0% | 100.3 |
| Specific Rotation | ﹢7.5° - ﹢8.5° | 7.9° |
| PH | 4.5-6.0 | 5.4 |
| Loss on drying | ≤1.0% | 0. 1 |
| Residue on ignition | ≤0.20% | 0. 1 |
| Chloride | ≤0.02% | ＜0.02% |
| Sulfate | ≤0.02% | ＜0.02% |
| Particle size | 90% through 0. 18mm mesh | Conform |
| Heavy metals | ≤10ppm | ＜10ppm |
| Iron（Fe） | ≤30ppm | ＜30ppm |
| Arsenic(As) | ≤2ppm | ＜2ppm |
| Mercury(Hg) | ≤0. 1ppm | ＜0. 1ppm |
| Cadmium | ≤1ppm | ＜1ppm |
| Total Plate Count | ≤1000CFU/g | ＜1000CFU/g |
| Yeast and Molds | ≤100 CFU/g | ＜100 CFU/g |
| Coliforms | Negative | Negative |
| Salmonella | Negative in 25g | Conformsconform |
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