PlainVitamins

Amino Complex 500 mg

by Quest · capsule · 90 capsules

  • Off the market since October 2023 (NIH)
  • UPC 0 58371 21856 2
  • DSLD label 23844
  • Serving 2 capsules

Amino Complex 500 mg by Quest lists 18 ingredients, 18 with an amount per serving of 2 capsules, such as 500 mg of hydrolyzed casein, 100 mg of L-glutamic acid, 50.5 mg of L-proline and 41 mg of L-leucine. Its current label entered the NIH Dietary Supplement Label Database on August 23, 2013.

What is in Amino Complex 500 mg?

Each row as the label prints it, per serving of 2 capsules. 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 Complex 500 mg: Supplement Facts rows against the market (DSLD label 23844, January 2026 release)
IngredientAmount% DVAmong products listing it
Hydrolyzed Caseinas cow milkHydrolyzed Casein (Form: cow milk) Note: providing500 mgCasein Protein in Amino Complex 500 mg against 44 products0.5 g per serving; the middle half of products list 7.59 g to 13.02 g, the median 11 g.0.5 g

86% of 44 products listing casein protein give more (median 11 g).

L-Glutamic Acid100 mgGlutamic Acid in Amino Complex 500 mg against 697 products100 mg per serving; the middle half of products list 25 mg to 364 mg, the median 80 mg.100 mg

Higher than 52% of 697 products listing glutamic acid (median 80 mg).

L-Proline50.5 mgProline in Amino Complex 500 mg against 387 products50.5 mg per serving; the middle half of products list 100 mg to 1,289 mg, the median 487.5 mg.50.5 mg

84% of 387 products listing proline give more (median 487.5 mg).

L-Leucine41 mgLeucine in Amino Complex 500 mg against 2,056 products0.041 g per serving; the middle half of products list 1 g to 3.5 g, the median 2.5 g.0.041 g

96% of 2,056 products listing leucine give more (median 2.5 g).

L-Lysine36.5 mgLysine in Amino Complex 500 mg against 1,250 products36.5 mg per serving; the middle half of products list 148.25 mg to 996.25 mg, the median 500 mg.36.5 mg

91% of 1,250 products listing lysine give more (median 500 mg).

L-Valine32 mgValine in Amino Complex 500 mg against 1,632 products0.032 g per serving; the middle half of products list 0.5 g to 1.5 g, the median 1.25 g.0.032 g

97% of 1,632 products listing valine give more (median 1.25 g).

L-Aspartic Acid31.5 mgAspartic Acid in Amino Complex 500 mg against 377 products31.5 mg per serving; the middle half of products list 106 mg to 1,846 mg, the median 337 mg.31.5 mg

92% of 377 products listing aspartic acid give more (median 337 mg).

L-Serine28 mgSerine in Amino Complex 500 mg against 314 products28 mg per serving; the middle half of products list 100 mg to 1,056 mg, the median 408 mg.28 mg

92% of 314 products listing serine give more (median 408 mg).

L-Tyrosine28 mgTyrosine in Amino Complex 500 mg against 1,680 products28 mg per serving; the middle half of products list 150 mg to 989 mg, the median 500 mg.28 mg

95% of 1,680 products listing tyrosine give more (median 500 mg).

L-Isoleucine27 mgIsoleucine in Amino Complex 500 mg against 1,614 products0.027 g per serving; the middle half of products list 0.5 g to 1.5 g, the median 1.23 g.0.027 g

98% of 1,614 products listing isoleucine give more (median 1.23 g).

L-Phenylalanine22 mgPhenylalanine in Amino Complex 500 mg against 611 products22 mg per serving; the middle half of products list 100 mg to 597.5 mg, the median 250 mg.22 mg

94% of 611 products listing phenylalanine give more (median 250 mg).

L-Threonine21.5 mgTHREONINE in Amino Complex 500 mg against 590 products21.5 mg per serving; the middle half of products list 140 mg to 886.25 mg, the median 500 mg.21.5 mg

94% of 590 products listing THREONINE give more (median 500 mg).

L-Arginine18 mgArginine in Amino Complex 500 mg against 1,455 products18 mg per serving; the middle half of products list 167 mg to 1,000 mg, the median 500 mg.18 mg

97% of 1,455 products listing arginine give more (median 500 mg).

L-Histidine13.5 mgHistidine in Amino Complex 500 mg against 591 products13.5 mg per serving; the middle half of products list 50 mg to 402.8 mg, the median 125 mg.13.5 mg

91% of 591 products listing histidine give more (median 125 mg).

L-Alanine13 mgAlanine in Amino Complex 500 mg against 475 products13 mg per serving; the middle half of products list 100 mg to 972 mg, the median 483 mg.13 mg

96% of 475 products listing alanine give more (median 483 mg).

L-Methionine12.5 mgMETHIONINE in Amino Complex 500 mg against 981 products12.5 mg per serving; the middle half of products list 25 mg to 250 mg, the median 100 mg.12.5 mg

87% of 981 products listing METHIONINE give more (median 100 mg).

Glycine12 mgGlycine in Amino Complex 500 mg against 1,078 products12 mg per serving; the middle half of products list 100 mg to 846 mg, the median 300 mg.12 mg

97% of 1,078 products listing glycine give more (median 300 mg).

Alpha-Glucan Oligosaccharide1.5 mgAlpha Glucans in Amino Complex 500 mg against 73 products1.5 mg per serving; the middle half of products list 27.5 mg to 480 mg, the median 138.2 mg.1.5 mg

96% of 73 products listing alpha glucans give more (median 138.2 mg).

Source: NIH ODS Dietary Supplement Label Database, label 23844 (entered August 23, 2013), 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:

  • 96% of the 2,056 products that print an amount of leucine list more than its 0.041 g of L-leucine (filed by NIH under leucine) (median 2.5 g).
  • 91% of the 1,250 products that print an amount of lysine list more than its 36.5 mg of L-lysine (filed by NIH under lysine) (median 500 mg).
  • 97% of the 1,632 products that print an amount of valine list more than its 0.032 g of L-valine (filed by NIH under valine) (median 1.25 g).
  • 92% of the 377 products that print an amount of aspartic acid list more than its 31.5 mg of L-aspartic acid (filed by NIH under aspartic acid) (median 337 mg).
  • 92% of the 314 products that print an amount of serine list more than its 28 mg of L-serine (filed by NIH under serine) (median 408 mg).
  • 95% of the 1,680 products that print an amount of tyrosine list more than its 28 mg of L-tyrosine (filed by NIH under tyrosine) (median 500 mg).

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 Complex 500 mg'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
Recommended Use: A source of essential amino acids for the maintenance of good health in those who require performed amino acids. Recommended Dose (Adults): Take 2 capsules daily.
Warnings
Risk Information: Do not use if pregnant or breastfeeding, unless on the advice of a health care practitioner. Consult a health care practitioner prior to use if you take blood pressure lowering medication.
KEEP OUT OF REACH OF CHILDREN.
DO NOT USE IF SEAL UNDER CAP IS BROKEN.
Allergens and what it does not contain
This product does not contain corn, egg, gluten, shellfish, soy or sulfites.
No artificial colours, flavours or preservatives
Storage
STORE IN A COOL, DRY PLACE.

Source: label statements in DSLD label 23844.

What else is on the label?

Other ingredients: Magnesium Stearate, Gelatin.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): SunOpta A healthy products company; PREMIUM - QUALITY ASSURED; {Recycle}.

How many labels does Amino Complex 500 mg have?

One label is on file, entered on August 23, 2013.

  1. Label 23844 (current) Entered August 23, 2013 · off the market October 12, 2023 · 90 capsules · UPC 0 58371 21856 2

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

Who makes it?

The label names SunOpta Inc. (manufacturer), Acton, ON. All Quest products.

Where next?