L-Lysine Powder
by Source Naturals · powder · 3.53 ounces
- On the market (NIH)
- UPC 0 21078 00135 5
- DSLD label 295947
- Serving 0.25 to 0.5 tsp; amounts per 0.5 tsp
- 73 servings
L-Lysine Powder by Source Naturals lists one ingredient: 1.36 g of L-lysine hydrochloride per serving of 0.5 tsp. Its current label entered the NIH Dietary Supplement Label Database on September 25, 2023.
What is in L-Lysine Powder?
Each row as the label prints it, per serving of 0.5 tsp. 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).
| Ingredient | Amount | % DV | Among products listing it |
|---|---|---|---|
| L-Lysine Hydrochloride | 1.36 g | Higher than 88% of 1,250 products listing lysine (median 500 mg). |
Source: NIH ODS Dietary Supplement Label Database, label 295947 (entered September 25, 2023), 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?
Every amount on this label with a position sits within the middle 80% of the products that list the same ingredient.
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?
6 products list the very same ingredients; the nearest amounts come first.
- Amino L-LysineGenestra Brands same ingredients
- L-LysineDesigns for Health same ingredients
- Lysine 500 mgVital Nutrients same ingredients
- Free Form L-Lysine 550 mgASN Advanced Sport Nutriceuticals · off the market same ingredients
- Maximum Strength L-Lysine Viraguard 1000 mgVitamin World · off the market same ingredients
- L-Lysine 1000GNC · off the market same ingredients
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: 1/4 to 1/2 teaspoon daily between meals.
- Warnings
- Note: If you are pregnant, may become pregnant, or breastfeeding, consult your health care professional before using this product.
- Do not use if either tamper-evident seal is broken or missing.
- Keep out of the reach of children.
- Allergens and what it does not contain
- Contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contains starch, salt, preservatives, or artificial color, flavor or fragrance.
Source: label statements in DSLD label 295947.
How many labels does L-Lysine Powder have?
2 labels are on file under this name since November 22, 2022: other sizes, label designs and reformulations. The current one leads this page.
- Label 295947 (current) Entered September 25, 2023 · on the market · 3.53 ounces · UPC 0 21078 00135 5
- Label 274773 Entered November 22, 2022 · off the market July 6, 2022 · 3.53 ounces · UPC 0 21078 00135 5
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.