PlainVitamins

C/Lysine Plus

by Douglas Laboratories · capsule · 120 vegetarian capsules

  • On the market (NIH)
  • UPC 3 10539 00339 8
  • DSLD label 232242
  • Serving 4 vegetarian capsules
  • 30 servings

C/Lysine Plus by Douglas Laboratories lists 2 ingredients, 2 with an amount per serving of 4 vegetarian capsules, such as 2,000 mg of vitamin C and 1,000 mg of L-lysine hydrochloride. Its current label entered the NIH Dietary Supplement Label Database on August 23, 2020.

What is in C/Lysine Plus?

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

C/Lysine Plus: Supplement Facts rows against the market (DSLD label 232242, January 2026 release)
IngredientAmount% DVAmong products listing it
Vitamin Cas Ascorbic Acid2,000 mg2,222%Vitamin C in C/Lysine Plus against 18,583 products2,000 mg per serving; the middle half of products list 60 mg to 270 mg, the median 100 mg.DV 90 mgUL 2,000 mg2,000 mg

Higher than over 99% of 18,583 products listing vitamin C (median 100 mg). Per day at the most servings: 4,000 mg. 2 times the adult UL a day.

L-Lysine Hydrochloride1,000 mgLysine in C/Lysine Plus against 1,250 products1,000 mg per serving; the middle half of products list 148.25 mg to 996.25 mg, the median 500 mg.1,000 mg

Higher than 75% of 1,250 products listing lysine (median 500 mg). Per day at the most servings: 2,000 mg.

Source: NIH ODS Dietary Supplement Label Database, label 232242 (entered August 23, 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 2 servings a day, the most its directions give, the label lists 4,000 mg of vitamin C, 2 times the adult Tolerable Upper Intake Level.

The NIH database records 1 to 2 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?

6 products list the very same ingredients; the nearest amounts come first.

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: Adults take 4 capsules 1-2 times daily or as directed by a health professional.
Warnings
Warning: If you are pregnant, nursing, have any health condition or taking any medication, consult your health professional before using this product.
Keep out of the reach of children.
Use only if safety seal is intact.
Allergens and what it does not contain
Gluten-free, Non-GMO
Storage
Store in a cool, dry place.

Source: label statements in DSLD label 232242.

What else is on the label?

Other ingredients: Hydroxypropyl Methylcellulose, Hydroxypropyl Cellulose, Ascorbyl Palmitate, Citrus Bioflavonoids, Microcrystalline Cellulose.

How many labels does C/Lysine Plus have?

3 labels are on file under this name since February 23, 2012: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 232242 (current) Entered August 23, 2020 · on the market · 120 vegetarian capsules · UPC 3 10539 00339 8
  2. Label 9834 Entered June 1, 2012 · off the market June 26, 2020 · 120 capsules · UPC 3 10539 00339 8
  3. Label 5418 Entered February 23, 2012 · off the market January 20, 2012 · 120 capsules · UPC 3 10539 00339 8

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?