Daily Amino Acid

product on market Tablet or Pill 21st Century 🟢 Safety: 100/100
Brand: 21st Century
🟢 100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 8% of ingredients have research evidence
B Label Compliance Grade

Product Label

Label for Daily Amino Acid
📄 Open Full PDF View on NIH DSLD →
📸

Have a supplement label? Find it here.

Upload a photo of any supplement label to search our database of 92,312 products.

Label Data

1 Tablet(s) Serving Size
120 Servings
Other Combinations Product Type
8% Evidence Coverage

Supplement Facts — Evidence Check

Calcium
150 mg (12% DV)
Sodium
5 mg (1% DV)
L-Histidine
17 mg
63 mg
📊 Market median: 17.4mg (161 products)
Median 17.4mg This product: 63mg
105 mg
📊 Market median: 17.4mg (161 products)
Median 17.4mg This product: 105mg
93 mg
📊 Market median: 500.0mg (159 products)
Median 500.0mg This product: 93mg
21 mg
📊 Market median: 500.0mg (193 products) 📚 7 studies — no high-quality reviews
This product: 21mg
L-Cysteine
11 mg
L-Phenylalanine
32 mg
31 mg
📊 Market median: 500.0mg (223 products) 📚 22 studies (Tier A: 0, B: 1)
This product: 31mg
L-Threonine
69 mg
L-Valine
58 mg

Other Ingredients

Whey Cellulose Stearic Acid Croscarmellose Sodium Magnesium Silicate Magnesium Stearate PEG Polysorbate Polyvinyl alcohol Silicon Dioxide

Label Claims — Verification

❓ Nutrient
❓ All Other
❓ Structure/Function
All Other (98% of products) Structure/Function (78% of products) Nutrient (56% of products)

Target Groups

Adult (18 - 50 Years) Gluten Free

Product Information

📋 Directions for Use

Directions: As a dietary supplement, adults take one (1) tablet daily with any meal or as directed by a healthcare provider. Do not exceed recommended dosage. Individual results may vary.

⚠️ Warnings & Precautions

Warning: Consult a healthcare provider prior to use if pregnant, nursing, on medications, have a medical condition or are planning a medical procedure.

Stop use and contact a physician if adverse reactions occur.

Keep out of reach of children.

Do not use if product appears to be tampered with or seal is broken.

Do not exceed recommended dosage.

Contains milk (whey).

🧪 Formulation Notes

Amino acids are the building blocks of protein and support the health and growth of muscle tissue.

No added sugar, yeast, preservatives, artificial flavors or colors.

A combination of important amino acids

Muscle support

Gluten free

Additional Information

Store at room temperature.

Guaranteed Quality Laboratory Tested

Product Details

UPC / SKU 7 40985 22557 8
DSLD Entry Date 2021-12-18
Product Type Other Combinations
Form Tablet or Pill
Brand 21st Century
DSLD ID 258438
Data Updated 2026-04-11

Research Evidence

50 Research Sources
47 Avg Quality Score
28 Rct
13 Clinical Trial
5 Guideline
4 Systematic Review
A Using a Novel Consensus-Based Chemoinformatics Approach to Predict ADMET Properties and Druglikeness of Tyrosine Kinase Inhibitors.
Guideline International journal of molecular sciences 2025
PubMed DOI
B Australia and New Zealand consensus statement on the cardiovascular management of patients with chronic lymphocytic leukaemia treated with Bruton's tyrosine kinase inhibitors.
Guideline Internal medicine journal 2025
PubMed DOI
B Branched-chain amino acid supplementation for improving growth and development in term and preterm neonates
Systematic Review The Cochrane database of systematic reviews 2020
PubMed DOI Cochrane
B [Clinical practice guideline on anaplastic lymphoma kinase-tyrosine kinase inhibitors for non-small cell lung cancer (2025 edition)].
Guideline Zhonghua zhong liu za zhi [Chinese journal of oncology] 2025
PubMed DOI
B [Chinese expert consensus on epidermal growth factor receptor tyrosine kinase inhibitors for the treatment of non-small cell lung cancer (2025 edition)].
Guideline Zhonghua yi xue za zhi 2025
PubMed DOI
B Consensus Guideline for the Diagnosis and Treatment of Tyrosine Hydroxylase (TH) Deficiency.
Guideline Journal of inherited metabolic disease 2025
PubMed DOI
B Baseline-dependent effect of dopamine's precursor L-tyrosine on working memory gating but not updating
Rct Cognitive, affective & behavioral neuroscience 2020
PubMed DOI
B Effect of Amino Acid Supplementation on Iron Regulation after Endurance Exercise
Rct Nutrients 2023
PubMed DOI
C Attenuating Muscle Damage Biomarkers and Muscle Soreness After an Exercise-Induced Muscle Damage with Branched-Chain Amino Acid (BCAA) Supplementation: A Systematic Review and Meta-analysis with Meta-regression
Systematic Review Sports medicine - open 2024
PubMed DOI
C The Effects of Green Tea Amino Acid L-Theanine Consumption on the Ability to Manage Stress and Anxiety Levels: a Systematic Review
Systematic Review Plant foods for human nutrition (Dordrecht, Netherlands) 2020
PubMed DOI
View all evidence for Tyrosine →

Compare Similar Products

Amino Acid Chelated Copper 2 mg
Amino Acid Chelated Copper 2 mg Vitamin World 100
Magnesium 200 mg as Amino Acid Chelate Martin Avenue Pharmacy 100
L-Tyrosine-S Nutri-West 100
Amino-Acid Complex 1200 mg Sunshine Naturals 100
L-Tyrosine 500 mg Highland Laboratories 100
View all Tyrosine products →
Tyrosine research & evidence Best Tyrosine rankings All Tyrosine products More from 21st Century View on NIH DSLD →