PlainVitamins

Amino Day

by Source Naturals · tablet or pill · 120 tablets

  • On the market (NIH)
  • UPC 0 21078 00184 3
  • DSLD label 274466
  • Serving 2 to 3 tablets; amounts per 3 tablets
  • 40 servings

Amino Day by Source Naturals lists 22 ingredients, 2 with an amount per serving of 3 tablets, such as 45 mg of vitamin C and 15 mg of vitamin B6; 20 sit inside a blend without their own amounts. Its current label entered the NIH Dietary Supplement Label Database on October 24, 2022.

What is in Amino Day?

Each row as the label prints it, per serving of 3 tablets. The capsule beside an amount places it among every product in the NIH database that lists the same ingredient: the bar is the middle half of their amounts, the line in it the median, the whiskers the 10th and 90th percentiles; the green tick is the FDA Daily Value and the red dashed tick the adult upper limit (IOM).

Amino Day: Supplement Facts rows against the market (DSLD label 274466, January 2026 release)
IngredientAmount% DVAmong products listing it
Calories15 Calories
Vitamin Cas Ascorbic Acid45 mg75%Vitamin C in Amino Day against 18,583 products45 mg per serving; the middle half of products list 60 mg to 270 mg, the median 100 mg.DV 90 mgUL 2,000 mg45 mg

80% of 18,583 products listing vitamin C give more (median 100 mg).

Vitamin B6as Pyridoxine Hydrochloride15 mg750%Vitamin B6 in Amino Day against 15,277 products15 mg per serving; the middle half of products list 2 mg to 20 mg, the median 6 mg.DV 1.7 mgUL 100 mg15 mg

Higher than 68% of 15,277 products listing vitamin B6 (median 6 mg).

Proprietary Blend3 g
L-Tyrosinein the blend, no amount given
L-Leucinein the blend, no amount given
L-Lysine Hydrochloridein the blend, no amount given
L-Phenylalaninein the blend, no amount given
L-Methioninein the blend, no amount given
L-Glutamic Acidin the blend, no amount given
Glycinein the blend, no amount given
L-Glutaminein the blend, no amount given
L-Cysteinein the blend, no amount given
L-Ornithine Hydrochloridein the blend, no amount given
L-Histidinein the blend, no amount given
L-Threoninein the blend, no amount given
L-Isoleucinein the blend, no amount given
L-Valinein the blend, no amount given
L-Argininein the blend, no amount given
L-Serinein the blend, no amount given
L-Alaninein the blend, no amount given
L-Prolinein the blend, no amount given
Taurinein the blend, no amount given
L-Aspartic Acidin the blend, no amount given

Source: NIH ODS Dietary Supplement Label Database, label 274466 (entered October 24, 2022), version 9.4.0. See the label on DSLD or its label image (PDF). Amounts are what the maker printed; DSLD does not test products. Daily Values: the FDA's Daily Value page.

Is that a lot?

Every amount on this label with a position sits within the middle 80% of the products that list the same ingredient; 20 ingredients sit inside a blend, so their amounts cannot be compared.

The NIH database records one serving a day from the label's directions; its % Daily Values are for adults and children 4 or more years of age. The directions as printed are further down this page.

The Tolerable Upper Intake Level is the most of a nutrient per day, from food, water and supplements together, that is likely to pose no risk for almost all adults (Institute of Medicine, 2011). It does not apply under medical supervision. This page compares labels; it is not medical advice.

Sources: amounts from the DSLD label; Daily Values from 21 CFR 101.9(c)(8)(iv); adult upper limits from the Institute of Medicine's DRI summary tables (2011). How positions are computed.

Which products have the closest formulas?

The products whose ingredient lists overlap most with Amino Day's, rare ingredients counting for more.

  • Amino 21DaVinci Laboratories 20 shared, 92% alike
  • AminocapsIntensive Nutrition · off the market 21 shared, 91% alike
  • Amino BlendPL Progressive Laboratories · off the market 20 shared, 89% alike
  • Amino Acid ComplexSuperLife 19 shared, 87% alike
  • AminoLogicPhysioLogics · off the market 19 shared, 87% alike
  • Amino AthleteSource Naturals Athletic Series 22 shared, 86% alike

Source: ingredient lists of every product's current label in DSLD (version 9.4.0); similarity weights each shared ingredient by how rare it is.

What does the label say about taking it?

Quoted from the label as DSLD transcribed it: the maker's words, including any claim about what the product does, which the FDA has not evaluated and PlainVitamins does not endorse.

Directions
Suggested Use: 2 to 3 tablets 45 minutes before meals.
Warnings
Do not use if either tamper-evident seal is broken or missing.
Keep out of the reach of children.
Warning: Contains phenylalanine and tyrosine. Not to be used by phenylketonurics, women who are pregnant, may become pregnant, or breastfeeding, or with antidepressant drugs containing MAOIs or SSRIs.
If you have chronic high blood pressure, consult your health care professional before using this product.
Allergens and what it does not contain
Plus, crystalline amino acids are fat free and very low in calories.
Storage
Keep tightly closed after each use.

Source: label statements in DSLD label 274466.

What else is on the label?

Other ingredients: Stearic Acid, Microcrystalline Cellulose, Sorbitol, Silica, modified Cellulose Gum, Magnesium Stearate.

How many labels does Amino Day have?

One label is on file, entered on October 24, 2022.

  1. Label 274466 (current) Entered October 24, 2022 · on the market · 120 tablets · UPC 0 21078 00184 3

Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).

Who makes it?

The label names Source Naturals, Inc. (distributor), Santa Cruz, CA. All Source Naturals products.

Where next?