PlainVitamins

Arthro-Syn

by Douglas Laboratories · capsule · 120 capsules

  • On the market (NIH)
  • UPC 3 10539 00493 7
  • DSLD label 8127
  • Serving 4 capsules
  • 30 servings

Arthro-Syn by Douglas Laboratories lists 34 ingredients, 34 with an amount per serving of 4 capsules, such as 2,500 IU of vitamin A, 500 mg of vitamin C, 100 IU of vitamin E and 40 mg of thiamine. Its current label entered the NIH Dietary Supplement Label Database on April 26, 2012.

What is in Arthro-Syn?

Each row as the label prints it, per serving of 4 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).

Arthro-Syn: Supplement Facts rows against the market (DSLD label 8127, January 2026 release)
IngredientAmount% DVAmong products listing it
Vitamin A2,500 IU50%Vitamin A in Arthro-Syn against 5,772 products2,500 IU per serving; the middle half of products list 2,000 IU to 5,000 IU, the median 4,000 IU.2,500 IU

59% of 5,772 products listing vitamin A give more (median 4,000 IU).

Vitamin Cas Ascorbic Acid500 mg833%Vitamin C in Arthro-Syn against 18,583 products500 mg per serving; the middle half of products list 60 mg to 270 mg, the median 100 mg.DV 90 mgUL 2,000 mg500 mg

Higher than 81% of 18,583 products listing vitamin C (median 100 mg).

Vitamin E100 IU333%Vitamin E in Arthro-Syn against 6,459 products100 IU per serving; the middle half of products list 15 IU to 100 IU, the median 30 IU.100 IU

Higher than 71% of 6,459 products listing vitamin E (median 30 IU).

Thiamine40 mg2,667%Thiamin in Arthro-Syn against 9,830 products40 mg per serving; the middle half of products list 1.5 mg to 25 mg, the median 5 mg.DV 1.2 mg40 mg

Higher than 81% of 9,830 products listing thiamin (median 5 mg).

Riboflavin20 mg1,177%Riboflavin in Arthro-Syn against 9,824 products20 mg per serving; the middle half of products list 1.7 mg to 25 mg, the median 4 mg.DV 1.3 mg20 mg

Higher than 72% of 9,824 products listing riboflavin (median 4 mg).

Niacin/Niacinamide100 mg500%Niacin in Arthro-Syn against 12,413 products100 mg per serving; the middle half of products list 13.2 mg to 48 mg, the median 20 mg.DV 16 mgUL 35 mg100 mg

Higher than 88% of 12,413 products listing niacin (median 20 mg). 2.9 times the adult UL a day.

Vitamin B6as Pyridoxine HydrochlorideVitamin B-6 (Form: as Pyridoxine HCl)50 mg2,500%Vitamin B6 in Arthro-Syn against 15,277 products50 mg per serving; the middle half of products list 2 mg to 20 mg, the median 6 mg.DV 1.7 mgUL 100 mg50 mg

Higher than 87% of 15,277 products listing vitamin B6 (median 6 mg).

Folic Acid200 mcg50%Folate in Arthro-Syn against 7,022 products200 mcg per serving; the middle half of products list 200 mcg to 400 mcg, the median 400 mcg.200 mcg

71% of 7,022 products listing folate give more (median 400 mcg).

Vitamin B1250 mcg833%Vitamin B12 in Arthro-Syn against 14,425 products50 mcg per serving; the middle half of products list 6 mcg to 200 mcg, the median 36 mcg.DV 2.4 mcg50 mcg

Higher than 51% of 14,425 products listing vitamin B12 (median 36 mcg).

Pantothenic Acidas Calcium PantothenatePantothenic Acid (Form: as Calcium Pantothenate)50 mg500%Pantothenic Acid (Vitamin B5) in Arthro-Syn against 10,060 products50 mg per serving; the middle half of products list 6 mg to 50 mg, the median 12 mg.DV 5 mg50 mg

Higher than 72% of 10,060 products listing pantothenic acid (vitamin B5) (median 12 mg).

Calciumas Calcium CitrateCalcium (Form: from Calcium Citrate Complex)125 mg13%Calcium in Arthro-Syn against 17,831 products125 mg per serving; the middle half of products list 50 mg to 252 mg, the median 115 mg.DV 1,300 mgUL 2,500 mg125 mg

Higher than 53% of 17,831 products listing calcium (median 115 mg).

Magnesiumas Magnesium Aspartate ComplexMagnesium (Form: from Magnesium Aspartate Complex)125 mg31%Magnesium in Arthro-Syn against 14,003 products125 mg per serving; the middle half of products list 30 mg to 200 mg, the median 86 mg.UL 350 mgDV 420 mg125 mg

Higher than 66% of 14,003 products listing magnesium (median 86 mg).

Zincas Zinc AspartateZinc (Form: from Zinc Aspartate Complex)25 mg167%Zinc in Arthro-Syn against 13,186 products25 mg per serving; the middle half of products list 5 mg to 15 mg, the median 11 mg.DV 11 mgUL 40 mg25 mg

Higher than 85% of 13,186 products listing zinc (median 11 mg).

Seleniumas SelenomethionineSelenium (Form: from Seleno-Methionine)50 mcg71%Selenium in Arthro-Syn against 7,658 products50 mcg per serving; the middle half of products list 27 mcg to 100 mcg, the median 55 mcg.DV 55 mcgUL 400 mcg50 mcg

56% of 7,658 products listing selenium give more (median 55 mcg).

Copperas Copper Sebecate ComplexCopper (Form: from Copper Sebecate Complex)2 mg100%Copper in Arthro-Syn against 6,468 products2 mg per serving; the middle half of products list 0.5 mg to 2 mg, the median 1 mg.DV 0.9 mgUL 10 mg2 mg

Higher than 66% of 6,468 products listing copper (median 1 mg).

Manganeseas Manganese SulfateManganese (Form: from Manganese Sulfate)100 mg5,000%

This amount is far outside what other labels list for manganese, or disagrees with the label's own %DV: possibly a unit or transcription slip in the database. Check the label image on DSLD.

Chromium100 mcg83%Chromium in Arthro-Syn against 7,825 products100 mcg per serving; the middle half of products list 45 mcg to 200 mcg, the median 100 mcg.DV 35 mcg100 mcg

47% of 7,825 products listing chromium give more (median 100 mcg).

Potassiumas Potassium Aspartate ComplexPotassium (Form: from Potassium Aspartate Complex)25 mg1%Potassium in Arthro-Syn against 11,614 products25 mg per serving; the middle half of products list 50 mg to 190 mg, the median 99 mg.DV 4,700 mg25 mg

86% of 11,614 products listing potassium give more (median 99 mg).

Hesperidin Complex25 mg
Rutin25 mgRutin in Arthro-Syn against 1,232 products25 mg per serving; the middle half of products list 10 mg to 50 mg, the median 25 mg.25 mg

37% of 1,232 products listing rutin give more (median 25 mg).

Bioflavonoids150 mgFlavonoid in Arthro-Syn against 2,343 products150 mg per serving; the middle half of products list 25 mg to 100 mg, the median 50 mg.150 mg

Higher than 81% of 2,343 products listing flavonoid (median 50 mg).

Cholineas Choline BitartrateCholine (Form: from 20mg Choline Bitartrate)9 mg2%*Choline in Arthro-Syn against 4,738 products9 mg per serving; the middle half of products list 18 mg to 100 mg, the median 40 mg.DV 550 mgUL 3,500 mg9 mg

89% of 4,738 products listing choline give more (median 40 mg).

Inositol20 mgInositol in Arthro-Syn against 4,042 products20 mg per serving; the middle half of products list 10 mg to 80 mg, the median 30 mg.20 mg

64% of 4,042 products listing inositol give more (median 30 mg).

Paba10 mgPABA in Arthro-Syn against 1,610 products10 mg per serving; the middle half of products list 10 mg to 50 mg, the median 25 mg.10 mg

72% of 1,610 products listing PABA give more (median 25 mg).

L-Cysteineas Sulfur75 mgCysteine in Arthro-Syn against 516 products75 mg per serving; the middle half of products list 30 mg to 200 mg, the median 85 mg.75 mg

52% of 516 products listing cysteine give more (median 85 mg).

L-Histidine25 mgHistidine in Arthro-Syn against 591 products25 mg per serving; the middle half of products list 50 mg to 402.8 mg, the median 125 mg.25 mg

83% of 591 products listing histidine give more (median 125 mg).

DL-Phenylalanine100 mgDL-phenylalanine in Arthro-Syn against 155 products100 mg per serving; the middle half of products list 135 mg to 500 mg, the median 300 mg.100 mg

75% of 155 products listing DL-phenylalanine give more (median 300 mg).

Omega-3 Fatty Acidsas Docosahexaenoic Acid, Eicosapentaenoic AcidOmega-3 Fatty Acids (Form: EPA, DHA)100 mgOmega-3 in Arthro-Syn against 2,714 products100 mg per serving; the middle half of products list 230 mg to 1,000 mg, the median 500 mg.100 mg

87% of 2,714 products listing omega-3 give more (median 500 mg).

Trypsin25 mgTrypsin in Arthro-Syn against 77 products25 mg per serving; the middle half of products list 35 mg to 100 mg, the median 75 mg.25 mg

79% of 77 products listing trypsin give more (median 75 mg).

Chymotrypsin25 mcgChymotrypsin in Arthro-Syn against 49 products0.025 mg per serving; the middle half of products list 2 mg to 5 mg, the median 3 mg.0.025 mg

98% of 49 products listing chymotrypsin give more (median 3 mg).

Bromelain150 mgBromelain in Arthro-Syn against 1,337 products150 mg per serving; the middle half of products list 25 mg to 200 mg, the median 50 mg.150 mg

Higher than 68% of 1,337 products listing bromelain (median 50 mg).

Bovine Tracheal Cartilageas Chondroitin Sulfate, MucopolysaccharidesBovine Tracheal Cartilage (Form: as Mucopolysaccharides, and Chondroitin Sulfate)100 mgCartilage in Arthro-Syn against 199 products100 mg per serving; the middle half of products list 40 mg to 750 mg, the median 100 mg.100 mg

47% of 199 products listing cartilage give more (median 100 mg).

Papain25 mgPapain in Arthro-Syn against 607 products25 mg per serving; the middle half of products list 20 mg to 75 mg, the median 40 mg.25 mg

63% of 607 products listing papain give more (median 40 mg).

Raw Veal Bone25 mgBone in Arthro-Syn against 49 products0.025 g per serving; the middle half of products list 0.983 g to 7.5 g, the median 3 g.0.025 g

94% of 49 products listing bone give more (median 3 g).

Yucca extract100 mgYucca in Arthro-Syn against 106 products100 mg per serving; the middle half of products list 25 mg to 450 mg, the median 50 mg.100 mg

Higher than 56% of 106 products listing yucca (median 50 mg).

* % Daily Value computed from the printed amount and the FDA Daily Value (21 CFR 101.9); the label prints none for that row.

Source: NIH ODS Dietary Supplement Label Database, label 8127 (entered April 26, 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:

  • At 1 serving a day, the most its directions give, the label lists 100 mg of niacin, 2.9 times the adult Tolerable Upper Intake Level.
  • 98% of the 49 products that print an amount of chymotrypsin list more than its 0.025 mg of chymotrypsin (median 3 mg).
  • 94% of the 49 products that print an amount of bone list more than its 0.025 g of raw veal bone (filed by NIH under bone) (median 3 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 Arthro-Syn'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
Suggested Usage: As a dietary supplement, adults take 4 capsules daily with meals, or as directed by your healthcare professional.
Warnings
KEEP OUT OF REACH OF CHILDREN.
Tamper resistant package, do not use if outer seal is missing.
Allergens and what it does not contain
This product contains NO yeast, wheat gluten, soy protein, milk/dairy, corn, sodium, sugar, starch, artificial coloring, preservatives or flavoring.
Storage
For optimal storage conditions, store in a cool, dry place. (59°-77°F/15°-25°C) (35-65% relative humidity)

Source: label statements in DSLD label 8127.

What else is on the label?

Other ingredients: Cellulose, Gelatin, Vegetable Stearate.

How many labels does Arthro-Syn have?

One label is on file, entered on April 26, 2012.

  1. Label 8127 (current) Entered April 26, 2012 · on the market · 120 capsules · UPC 3 10539 00493 7

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

Who makes it?

The label names Douglas Laboratories (manufacturer), Pittsburgh, PA. All Douglas Laboratories products.

Where next?