PlainVitamins

Gluco-Science

by Source Naturals · tablet or pill · 180 tablets

  • On the market (NIH)
  • UPC 0 21078 01446 1
  • DSLD label 214217
  • Serving 1 to 2 tablets; amounts per 2 tablets
  • 90 servings

Gluco-Science by Source Naturals lists 41 ingredients, 41 with an amount per serving of 2 tablets, such as 250 mg of vitamin C, 334 IU (8.35 mcg) of vitamin D3, 66 IU of vitamin E and 8 mg of thiamine. Its current label entered the NIH Dietary Supplement Label Database on February 26, 2020.

What is in Gluco-Science?

Each row as the label prints it, per serving of 2 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).

Gluco-Science: Supplement Facts rows against the market (DSLD label 214217, January 2026 release)
IngredientAmount% DVAmong products listing it
Calories5 Calories
Vitamin Cas Ascorbic Acid250 mg417%Vitamin C in Gluco-Science against 18,583 products250 mg per serving; the middle half of products list 60 mg to 270 mg, the median 100 mg.DV 90 mgUL 2,000 mg250 mg

Higher than 68% of 18,583 products listing vitamin C (median 100 mg). Per day at the most servings: 750 mg.

Vitamin D3as Cholecalciferol334 IU (8.35 mcg)84%Vitamin D in Gluco-Science against 14,175 products8.35 mcg per serving; the middle half of products list 10 mcg to 25 mcg, the median 15 mcg.DV 20 mcgUL 100 mcg8.35 mcg

80% of 14,175 products listing vitamin D give more (median 15 mcg). Per day at the most servings: 25.05 mcg.

Vitamin Eas D-Alpha-Tocopheryl SuccinateVitamin E (Form: as D-Alpha Tocopheryl Succinate)66 IU220%Vitamin E in Gluco-Science against 6,459 products66 IU per serving; the middle half of products list 15 IU to 100 IU, the median 30 IU.66 IU

Higher than 68% of 6,459 products listing vitamin E (median 30 IU). Per day at the most servings: 198 IU.

Thiamineas Vitamin B18 mg533%Thiamin in Gluco-Science against 9,830 products8 mg per serving; the middle half of products list 1.5 mg to 25 mg, the median 5 mg.DV 1.2 mg8 mg

Higher than 58% of 9,830 products listing thiamin (median 5 mg). Per day at the most servings: 24 mg.

Riboflavinas Vitamin B28 mg470%Riboflavin in Gluco-Science against 9,824 products8 mg per serving; the middle half of products list 1.7 mg to 25 mg, the median 4 mg.DV 1.3 mg8 mg

Higher than 60% of 9,824 products listing riboflavin (median 4 mg). Per day at the most servings: 24 mg.

Niacinamide66 mg333%Niacin in Gluco-Science against 12,413 products66 mg per serving; the middle half of products list 13.2 mg to 48 mg, the median 20 mg.DV 16 mgUL 35 mg66 mg

Higher than 85% of 12,413 products listing niacin (median 20 mg). Per day at the most servings: 198 mg. 5.7 times the adult UL a day.

Vitamin B6as Pyridoxine HydrochlorideVitamin B-6 (Form: as Pyridoxine HCl)33 mg1,650%Vitamin B6 in Gluco-Science against 15,277 products33 mg per serving; the middle half of products list 2 mg to 20 mg, the median 6 mg.DV 1.7 mgUL 100 mg33 mg

Higher than 84% of 15,277 products listing vitamin B6 (median 6 mg). Per day at the most servings: 99 mg.

Folateas Folic Acid200 mcg50%Folate in Gluco-Science 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). Per day at the most servings: 600 mcg.

Vitamin B12as CyanocobalaminVitamin B-12 (Form: as Cyanocobalamin)180 mcg3,000%Vitamin B12 in Gluco-Science against 14,425 products180 mcg per serving; the middle half of products list 6 mcg to 200 mcg, the median 36 mcg.DV 2.4 mcg180 mcg

Higher than 74% of 14,425 products listing vitamin B12 (median 36 mcg). Per day at the most servings: 540 mcg.

Biotin1.6 mg533%Biotin in Gluco-Science against 9,447 products1,600 mcg per serving; the middle half of products list 50 mcg to 300 mcg, the median 200 mcg.DV 30 mcg1,600 mcg

Higher than 88% of 9,447 products listing biotin (median 200 mcg). Per day at the most servings: 4,800 mcg.

Pantothenic Acidas Calcium D-Pantothenate, PantethinePantothenic Acid (Form: as Pantethine, & Calcium D-Pantothenate)16 mg160%Pantothenic Acid (Vitamin B5) in Gluco-Science against 10,060 products16 mg per serving; the middle half of products list 6 mg to 50 mg, the median 12 mg.DV 5 mg16 mg

Higher than 54% of 10,060 products listing pantothenic acid (vitamin B5) (median 12 mg). Per day at the most servings: 48 mg.

Magnesiumas Magnesium Citrate, Magnesium Malate, Magnesium OxideMagnesium (Form: as Magnesium Citrate, Magnesium Malate, & Magnesium Oxide)50 mg13%Magnesium in Gluco-Science against 14,003 products50 mg per serving; the middle half of products list 30 mg to 200 mg, the median 86 mg.UL 350 mgDV 420 mg50 mg

59% of 14,003 products listing magnesium give more (median 86 mg). Per day at the most servings: 150 mg.

Zincas Zinc CitrateZinc (Form: as Zinc Citrate)3 mg20%Zinc in Gluco-Science against 13,186 products3 mg per serving; the middle half of products list 5 mg to 15 mg, the median 11 mg.DV 11 mgUL 40 mg3 mg

84% of 13,186 products listing zinc give more (median 11 mg). Per day at the most servings: 9 mg.

Seleniumas L-Selenomethionine, Sodium SeleniteSelenium (Form: as L-Selenomethionine, & Sodium Selenite)33 mcg47%Selenium in Gluco-Science against 7,658 products33 mcg per serving; the middle half of products list 27 mcg to 100 mcg, the median 55 mcg.DV 55 mcgUL 400 mcg33 mcg

72% of 7,658 products listing selenium give more (median 55 mcg). Per day at the most servings: 99 mcg.

Manganeseas Manganese CitrateManganese (Form: as Manganese Citrate)1 mg50%Manganese in Gluco-Science against 7,016 products1 mg per serving; the middle half of products list 1 mg to 3.92 mg, the median 2 mg.DV 2.3 mgUL 11 mg1 mg

70% of 7,016 products listing manganese give more (median 2 mg). Per day at the most servings: 3 mg.

Chromiumas Chromium Picolinate, Chromium PolynicotinateChromium (Form: as Chromium Polynicotinate (Alt. Name: ChromeMate), & Chromium Picolinate)133 mcg108%Chromium in Gluco-Science against 7,825 products133 mcg per serving; the middle half of products list 45 mcg to 200 mcg, the median 100 mcg.DV 35 mcg133 mcg

Higher than 68% of 7,825 products listing chromium (median 100 mcg). Per day at the most servings: 399 mcg.

Gamma-Vitamin E Complex250 mg
Alpha-Lipoic Acid200 mgAlpha Lipoic Acid in Gluco-Science against 2,407 products200 mg per serving; the middle half of products list 25 mg to 150 mg, the median 50 mg.200 mg

Higher than 78% of 2,407 products listing alpha lipoic acid (median 50 mg). Per day at the most servings: 600 mg.

N-Acetyl Cysteine166 mgN-Acetyl Cysteine in Gluco-Science against 1,259 products166 mg per serving; the middle half of products list 55 mg to 500 mg, the median 150 mg.166 mg

Higher than 51% of 1,259 products listing N-acetyl cysteine (median 150 mg). Per day at the most servings: 498 mg.

Bitter Melon Fruit Extract150 mgBitter Melon in Gluco-Science against 273 products150 mg per serving; the middle half of products list 50 mg to 450 mg, the median 125 mg.150 mg

Higher than 52% of 273 products listing bitter melon (median 125 mg). Per day at the most servings: 450 mg.

Gymnema leaf extractas Gymnemic AcidsGymnema leaf extract (Form: 75% Gymnemic Acids) PlantPart: leaf121 mgGymnema in Gluco-Science against 444 products121 mg per serving; the middle half of products list 67 mg to 323.33 mg, the median 200 mg.121 mg

58% of 444 products listing gymnema give more (median 200 mg). Per day at the most servings: 363 mg.

Taurine100 mgTaurine in Gluco-Science against 2,337 products100 mg per serving; the middle half of products list 110 mg to 1,000 mg, the median 500 mg.100 mg

76% of 2,337 products listing taurine give more (median 500 mg). Per day at the most servings: 300 mg.

Cinnamomum spp. bark extract100 mg
Fenugreek83 mgFenugreek in Gluco-Science against 628 products149 mg per serving; the middle half of products list 100 mg to 600 mg, the median 300 mg.149 mg

71% of 628 products listing fenugreek give more (median 300 mg). Per day at the most servings: 447 mg.

L-Glutamine66 mgGlutamine in Gluco-Science against 1,850 products0.066 g per serving; the middle half of products list 0.356 g to 3 g, the median 1 g.0.066 g

92% of 1,850 products listing glutamine give more (median 1 g). Per day at the most servings: 0.198 g.

Hawthorn66 mgHawthorn in Gluco-Science against 589 products66 mg per serving; the middle half of products list 75 mg to 400 mg, the median 200 mg.66 mg

76% of 589 products listing hawthorn give more (median 200 mg). Per day at the most servings: 198 mg.

American Ginseng root extract66 mgAmerican Ginseng in Gluco-Science against 235 products66 mg per serving; the middle half of products list 75 mg to 425 mg, the median 200 mg.66 mg

79% of 235 products listing american ginseng give more (median 200 mg). Per day at the most servings: 198 mg.

Fenugreek seed extract66 mg
Holy Basil Leaf Extract66 mgHoly Basil in Gluco-Science against 387 products66 mg per serving; the middle half of products list 50 mg to 400 mg, the median 129 mg.66 mg

72% of 387 products listing holy basil give more (median 129 mg). Per day at the most servings: 198 mg.

Prickly Pear66 mgPrickly Pear Cactus in Gluco-Science against 104 products66 mg per serving; the middle half of products list 100 mg to 1,000 mg, the median 500 mg.66 mg

84% of 104 products listing prickly pear cactus give more (median 500 mg). Per day at the most servings: 198 mg.

Garlic50 mgGarlic in Gluco-Science against 1,075 products50 mg per serving; the middle half of products list 50 mg to 500 mg, the median 200 mg.50 mg

71% of 1,075 products listing garlic give more (median 200 mg). Per day at the most servings: 150 mg.

Maitake Mushroom50 mgMaitake Mushroom in Gluco-Science against 327 products50 mg per serving; the middle half of products list 30 mg to 200 mg, the median 100 mg.50 mg

58% of 327 products listing maitake mushroom give more (median 100 mg). Per day at the most servings: 150 mg.

Bilberry fruit extractas AnthocyanosidesBilberry fruit extract (Form: 32% Anthocyanosides) PlantPart: fruit40 mgBilberry in Gluco-Science against 896 products40 mg per serving; the middle half of products list 20 mg to 100 mg, the median 50 mg.40 mg

53% of 896 products listing bilberry give more (median 50 mg). Per day at the most servings: 120 mg.

Grape seed extract35 mgGrape in Gluco-Science against 1,900 products35 mg per serving; the middle half of products list 25 mg to 100 mg, the median 50 mg.35 mg

65% of 1,900 products listing grape give more (median 50 mg). Per day at the most servings: 105 mg.

Quercetin33 mgQuercetin in Gluco-Science against 1,548 products33 mg per serving; the middle half of products list 26.5 mg to 250 mg, the median 100 mg.33 mg

70% of 1,548 products listing quercetin give more (median 100 mg). Per day at the most servings: 99 mg.

Eleuthero root extract20 mgEleuthero in Gluco-Science against 726 products20 mg per serving; the middle half of products list 50 mg to 200 mg, the median 100 mg.20 mg

89% of 726 products listing eleuthero give more (median 100 mg). Per day at the most servings: 60 mg.

Inositol17 mgInositol in Gluco-Science against 4,042 products17 mg per serving; the middle half of products list 10 mg to 80 mg, the median 30 mg.17 mg

68% of 4,042 products listing inositol give more (median 30 mg). Per day at the most servings: 51 mg.

Myricetinas Bayberry bark/leaf extractMyricetin (Form: from Bayberry bark/leaf extract PlantPart: bark/leaf)16 mg
Tocotrienol Complex16 mg
Coenzyme Q103 mgCoenzyme Q-10 in Gluco-Science against 2,922 products3 mg per serving; the middle half of products list 30 mg to 100 mg, the median 60 mg.3 mg

95% of 2,922 products listing coenzyme Q-10 give more (median 60 mg). Per day at the most servings: 9 mg.

Vanadiumas Bis-Glycinato OxoVanadiumVanadium (Form: as Bis-Glycinato Oxo Vanadium)33 mcgVanadium in Gluco-Science against 1,744 products33 mcg per serving; the middle half of products list 10 mcg to 100 mcg, the median 25 mcg.UL 1,800 mcg33 mcg

Higher than 57% of 1,744 products listing vanadium (median 25 mcg). Per day at the most servings: 99 mcg.

Source: NIH ODS Dietary Supplement Label Database, label 214217 (entered February 26, 2020), 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 3 servings a day, the most its directions give, the label lists 198 mg of niacin, 5.7 times the adult Tolerable Upper Intake Level.
  • 92% of the 1,850 products that print an amount of glutamine list more than its 0.066 g of L-glutamine (filed by NIH under glutamine) (median 1 g).
  • 89% of the 726 products that print an amount of eleuthero list more than its 20 mg of eleuthero (median 100 mg).
  • 95% of the 2,922 products that print an amount of coenzyme Q-10 list more than its 3 mg of coenzyme Q10 (filed by NIH under coenzyme Q-10) (median 60 mg).

The NIH database records 3 servings 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 Gluco-Science'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: 1 to 2 tablets, three times daily before meals.
Note: Best results with this product may be obtained with long term use.
Warnings
Contains soy.
Warning: Do not use if you are taking any form of prescription nitrate such as nitroglycerin. If you have any disorder of blood sugar metabolism (such as diabetes, or hypoglycemia), or if you are taking insulin, any lipid-lowering, anticoagulant, or anti-platelet drug, or if you are pregnant, may become pregnant, or breastfeeding, consult your physician before using this product.
California Consumers: Warning: Reproductive Harm - www.P65Warnings.ca.gov/food
Do not use if either tamper-evident seal is broken or missing.
Keep out of the reach of children.

Source: label statements in DSLD label 214217.

What else is on the label?

Other ingredients: silicified Microcrystalline Cellulose, Stearic Acid, modified Cellulose Gum, Silica.

How many labels does Gluco-Science have?

2 labels are on file under this name since June 23, 2017: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 214217 (current) Entered February 26, 2020 · on the market · 180 tablets · UPC 0 21078 01446 1
  2. Label 75508 Entered June 23, 2017 · on the market · 90 tablets · UPC 0 21078 01445 4

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?