PlainVitamins

Maximum Strength Daily Amino Acid

by 21st Century · tablet or pill · 120 tablets

  • Off the market since August 2020 (NIH)
  • UPC 7 40985 22557 8
  • DSLD label 11184
  • Serving 1 tablet
  • 120 servings

Maximum Strength Daily Amino Acid by 21st Century lists 11 ingredients, 11 with an amount per serving of 1 tablet, such as 150 mg of calcium, 17 mg of L-histidine, 63 mg of L-isoleucine and 105 mg of L-leucine. Its current label entered the NIH Dietary Supplement Label Database on July 25, 2012.

What is in Maximum Strength Daily Amino Acid?

Each row as the label prints it, per serving of 1 tablet. 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).

Maximum Strength Daily Amino Acid: Supplement Facts rows against the market (DSLD label 11184, January 2026 release)
IngredientAmount% DVAmong products listing it
Calciumas Calcium Carbonate, Dicalcium PhosphateCalcium (Form: as Di Calcium Phosphate, and Calcium Carbonate)150 mg15%Calcium in Maximum Strength Daily Amino Acid against 17,831 products150 mg per serving; the middle half of products list 50 mg to 252 mg, the median 115 mg.DV 1,300 mgUL 2,500 mg150 mg

Higher than 58% of 17,831 products listing calcium (median 115 mg).

L-Histidine17 mgHistidine in Maximum Strength Daily Amino Acid against 591 products17 mg per serving; the middle half of products list 50 mg to 402.8 mg, the median 125 mg.17 mg

88% of 591 products listing histidine give more (median 125 mg).

L-Isoleucine63 mgIsoleucine in Maximum Strength Daily Amino Acid against 1,614 products0.063 g per serving; the middle half of products list 0.5 g to 1.5 g, the median 1.23 g.0.063 g

95% of 1,614 products listing isoleucine give more (median 1.23 g).

L-Leucine105 mgLeucine in Maximum Strength Daily Amino Acid against 2,056 products0.105 g per serving; the middle half of products list 1 g to 3.5 g, the median 2.5 g.0.105 g

93% of 2,056 products listing leucine give more (median 2.5 g).

L-Lysine93 mgLysine in Maximum Strength Daily Amino Acid against 1,250 products93 mg per serving; the middle half of products list 148.25 mg to 996.25 mg, the median 500 mg.93 mg

83% of 1,250 products listing lysine give more (median 500 mg).

DL-Methionine21 mgDL-Methionine in Maximum Strength Daily Amino Acid against 151 products21 mg per serving; the middle half of products list 25 mg to 132.5 mg, the median 50 mg.21 mg

79% of 151 products listing DL-methionine give more (median 50 mg).

Alpha-Glucan Oligosaccharide11 mgAlpha Glucans in Maximum Strength Daily Amino Acid against 73 products11 mg per serving; the middle half of products list 27.5 mg to 480 mg, the median 138.2 mg.11 mg

85% of 73 products listing alpha glucans give more (median 138.2 mg).

L-Phenylalanine32 mgPhenylalanine in Maximum Strength Daily Amino Acid against 611 products32 mg per serving; the middle half of products list 100 mg to 597.5 mg, the median 250 mg.32 mg

90% of 611 products listing phenylalanine give more (median 250 mg).

L-Tyrosine31 mgTyrosine in Maximum Strength Daily Amino Acid against 1,680 products31 mg per serving; the middle half of products list 150 mg to 989 mg, the median 500 mg.31 mg

93% of 1,680 products listing tyrosine give more (median 500 mg).

L-Threonine69 mgTHREONINE in Maximum Strength Daily Amino Acid against 590 products69 mg per serving; the middle half of products list 140 mg to 886.25 mg, the median 500 mg.69 mg

82% of 590 products listing THREONINE give more (median 500 mg).

L-Valine58 mgValine in Maximum Strength Daily Amino Acid against 1,632 products0.058 g per serving; the middle half of products list 0.5 g to 1.5 g, the median 1.25 g.0.058 g

95% of 1,632 products listing valine give more (median 1.25 g).

Source: NIH ODS Dietary Supplement Label Database, label 11184 (entered July 25, 2012), version 9.4.0. See the label on DSLD. Amounts are what the maker printed; DSLD does not test products. Daily Values: the FDA's Daily Value page.

Is that a lot?

The rows in the top or bottom tenth of the products that list the same ingredient, and any above the adult upper limit at the most servings a day the directions give:

  • 95% of the 1,614 products that print an amount of isoleucine list more than its 0.063 g of L-isoleucine (filed by NIH under isoleucine) (median 1.23 g).
  • 93% of the 2,056 products that print an amount of leucine list more than its 0.105 g of L-leucine (filed by NIH under leucine) (median 2.5 g).
  • 90% of the 611 products that print an amount of phenylalanine list more than its 32 mg of L-phenylalanine (filed by NIH under phenylalanine) (median 250 mg).
  • 93% of the 1,680 products that print an amount of tyrosine list more than its 31 mg of L-tyrosine (filed by NIH under tyrosine) (median 500 mg).
  • 95% of the 1,632 products that print an amount of valine list more than its 0.058 g of L-valine (filed by NIH under valine) (median 1.25 g).

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 Maximum Strength Daily Amino Acid's, rare ingredients counting for more.

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
Directions: Take one (1) tablet daily with any meal for maximum daily results, or as directed by your healthcare provider. Do not exceed recommended dosage.
Warnings
Keep out of reach of children.
Do not use if product appears to be tampered with or seal is broken.
Allergens and what it does not contain
No Added Sugar, Salt, Yeast, Preservatives, Artificial Flavors or Colors.
Storage
Store at room temperature.

Source: label statements in DSLD label 11184.

What else is on the label?

Other ingredients: Whey, Cellulose, Croscarmellose Sodium, Stearic Acid, Silicon Dioxide.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): MADE IN USA.

How many labels does Maximum Strength Daily Amino Acid have?

One label is on file, entered on July 25, 2012.

  1. Label 11184 (current) Entered July 25, 2012 · off the market August 5, 2020 · 120 tablets · UPC 7 40985 22557 8

DSLD also links this label to: Daily Amino Acid (image difference, same product), Daily Amino Acid (image difference, same product).

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

Who makes it?

The label names 21st Century HealthCare, Inc. (manufacturer), Tempe, AZ. All 21st Century products.

Where next?