PlainVitamins

HydroxyCal

by Karuna · capsule · 120 capsules

  • On the market (NIH)
  • UPC 0 18647 02106 7
  • DSLD label 327093
  • Serving 2 capsules
  • 60 servings

HydroxyCal by Karuna lists 10 ingredients, 10 with an amount per serving of 2 capsules, such as 150 mg of vitamin C, 25 mcg (1,000 IU) of vitamin D3, 330 mcg of vitamin K1 and 272 mg of calcium. Its current label entered the NIH Dietary Supplement Label Database on May 21, 2025.

What is in HydroxyCal?

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).

HydroxyCal: Supplement Facts rows against the market (DSLD label 327093, January 2026 release)
IngredientAmount% DVAmong products listing it
Vitamin Cas Ascorbic Acid150 mg167%Vitamin C in HydroxyCal against 18,583 products150 mg per serving; the middle half of products list 60 mg to 270 mg, the median 100 mg.DV 90 mgUL 2,000 mg150 mg

Higher than 58% of 18,583 products listing vitamin C (median 100 mg). Per day at the most servings: 450 mg.

Vitamin D3as Cholecalciferol1000 IU25 mcg (1,000 IU)125%Vitamin D in HydroxyCal against 14,175 products25 mcg per serving; the middle half of products list 10 mcg to 25 mcg, the median 15 mcg.DV 20 mcgUL 100 mcg25 mcg

Higher than 59% of 14,175 products listing vitamin D (median 15 mcg). Per day at the most servings: 75 mcg.

Vitamin K1as Phylloquinone330 mcg275%Vitamin K in HydroxyCal against 4,607 products330 mcg per serving; the middle half of products list 35 mcg to 100 mcg, the median 80 mcg.DV 120 mcg330 mcg

Higher than 95% of 4,607 products listing vitamin K (median 80 mcg). Per day at the most servings: 990 mcg.

Calciumas Calcium Citrate, Calcium Malate, Microcrystalline Hydroxyapatite Concentrate272 mg21%Calcium in HydroxyCal against 17,831 products272 mg per serving; the middle half of products list 50 mg to 252 mg, the median 115 mg.DV 1,300 mgUL 2,500 mg272 mg

Higher than 76% of 17,831 products listing calcium (median 115 mg). Per day at the most servings: 816 mg.

Phosphorusas Microcrystalline Hydroxyapatite80 mg6%Phosphorus in HydroxyCal against 3,786 products80 mg per serving; the middle half of products list 45 mg to 200 mg, the median 90 mg.DV 1,250 mgUL 4,000 mg80 mg

53% of 3,786 products listing phosphorus give more (median 90 mg). Per day at the most servings: 240 mg.

Magnesiumas Magnesium Chelate, Microcrystalline Hydroxyapatite Concentrate136 mg32%Magnesium in HydroxyCal against 14,003 products136 mg per serving; the middle half of products list 30 mg to 200 mg, the median 86 mg.UL 350 mgDV 420 mg136 mg

Higher than 69% of 14,003 products listing magnesium (median 86 mg). Per day at the most servings: 408 mg. 1.2 times the adult UL a day.

Manganeseas Albion Manganese Amino Acid Chelate1 mg43%Manganese in HydroxyCal 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.

Microcrystalline Hydroxyapatite Complex800 mg
Horsetailas Boron, Equisetum arvense20 mgHorsetail in HydroxyCal against 519 products20 mg per serving; the middle half of products list 20 mg to 200 mg, the median 67 mg.20 mg

74% of 519 products listing horsetail give more (median 67 mg). Per day at the most servings: 60 mg.

Boronas Boron Amino Acid Chelate1 mgBoron in HydroxyCal against 3,339 products1 mg per serving; the middle half of products list 0.3 mg to 2 mg, the median 1 mg.UL 20 mg1 mg

42% of 3,339 products listing boron give more (median 1 mg). Per day at the most servings: 3 mg.

Source: NIH ODS Dietary Supplement Label Database, label 327093 (entered May 21, 2025), 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?

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:

  • Its 330 mcg of vitamin K is higher than 95% of the 4,607 vitamin K products that print an amount; 246 list more.
  • At 3 servings a day, the most its directions give, the label lists 408 mg of magnesium, 1.2 times the adult Tolerable Upper Intake Level.

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 HydroxyCal'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 use for adults: Two capsules, three times daily with meals, or as directed by your health care practitioner.
Warnings
This product is intended for professional use and is manufactured under strict quality control to ensure the optimum in purity, potency and reliability.
Allergens and what it does not contain
This product contains no yeast, wheat, soy, corn, milk, salt, sugar, artificial coloring, preservatives or flavoring.
Storage
Keep in a cool, dry place, tightly capped.

Source: label statements in DSLD label 327093.

What else is on the label?

Other ingredients: Gelatin, Stearate.

How many labels does HydroxyCal have?

3 labels are on file under this name since August 23, 2013: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 327093 (current) Entered May 21, 2025 · on the market · 120 capsules · UPC 0 18647 02106 7
  2. Label 262708 Entered May 19, 2022 · off the market September 28, 2023 · 120 capsules · UPC 0 18647 02106 7
  3. Label 24483 Entered August 23, 2013 · off the market September 20, 2021 · 120 capsules · UPC 0 18647 02106 7

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

Who makes it?

The label names Karuna Corporation (manufacturer), Novato, CA. All Karuna products.

Where next?