BioStacks
DaVinci Laboratories

Amino 21

1 Capsule × 3/day · 90 servings · $0.37/serving

iHerbAmazon

Ingredients (21)

Glutamic Acid

100%

Dose/day

675 mg

Target

500–2000 mg

Form

—

L-Methionine

34%

Dose/day

67.5 mg

Target

200–1000 mg

Form

—

L-Taurine

23%

Dose/day

225 mg

Target

1000–3000 mg

Form

—

Tyrosine

18%

Dose/day

90 mg

Target

500–2000 mg

Form

—

DL-Phenylalanine

18%

Dose/day

90 mg

Target

500–1500 mg

Form

—

Other Ingredients (1)

Microcrystalline CelluloseBinder

Plant-derived cellulose used as a binder and filler in supplements

How to Take It

Take it anytime

No evidence a formula this broad works better at any particular hour. Take it between meals, away from food.

On an empty stomach
Keep it away from protein-heavy meals
Split into 3 doses across the day

On the label

As a dietary supplement, take 1 capsule between meals, 3 times daily, or as directed by your health care practitioner.

General guidance based on the ingredients, not a substitute for the label or your doctor.

Price Check

$33.60

$10$20$50

Near the median of 798 multivitamins

Track this supplement in your stack

Get personalized insights, interactions, and coverage recommendations.

Get Started Free

Similar Supplements

NOW Sports, Amino Complete, 120 Veg Capsules

NOW Sports

NOW Sports, Amino Complete, 120 Veg Capsules

💊 for General Health

32
Collagen Glow Up Powder

Nutrition Geeks

Collagen Glow Up Powder

✨ for Skin

71
Unflavored Marine Collagen (20 Pack)

Vital Proteins

Unflavored Marine Collagen (20 Pack)

✨ for Skin

37
Max-Amino Caps with Vitamin B6

Country Life

Max-Amino Caps with Vitamin B6

⚡ for Energy

59
Hydrolyzed Collagen Peptides

Igennus Healthcare Nutrition

Hydrolyzed Collagen Peptides

✨ for Skin

65

Sources & Scoring

Nutrient data (RDA, UL, and safety thresholds) sourced from: NIH Office of Dietary Supplements and National Academies Dietary Reference Intakes (DRI).

This is not medical advice. Consult a healthcare provider before making changes to your supplement routine.

The score analyzes what's on the label: ingredient doses vs. studied ranges, chemical forms, evidence levels, and known interactions. It does not verify label accuracy or test for contaminants — for that, look for third-party certifications like USP or NSF.

BioStacks

Know exactly what's in your supplements.

Navigate

  • Home
  • Manifesto
  • App Store
  • Google Play

Resources

  • Contact & Support
  • Pricing
  • Terms of Service
  • Privacy Policy
  • Refund Policy

Explore

  • Health Areas
  • Best Supplements
  • Nutrients
  • All Supplements

Popular Picks

  • Best Magnesium for Sleep
  • Best Collagen for Skin
  • Best Creatine for Muscle
  • Best Vitamin D for Bone Health
  • Best Probiotics for Digestion
  • Best CoQ10 for Heart

Free Tools

  • Interaction Checker
  • Dose Checker
  • Form Comparison

Field Guides

  • Magnesium for sleep
  • Reading labels
  • Interaction checker
  • Dose checker
  • Harmful ingredients
  • Proprietary blends
  • Stack building
  • Scan without barcode
  • All guides →
© 2026 BioStacks. All rights reserved. Not medical advice.