Douglas Laboratories · Amino acid/Protein supplement
L-Lysine
4 ingredients on file in the NIH Dietary Supplement Label Database, top 84% by ingredient count. Off-market, label data preserved for reference.
- 4
- Ingredients
- Top 84%
- By ingredient count
- 4
- Nutrient categories
L-Lysine is a amino acid/protein supplement by Douglas Laboratories in capsule form, listing 4 ingredients in the NIH Dietary Supplement Label Database (DSLD), maintained by the Office of Dietary Supplements at the National Institutes of Health. Currently listed as off-market (no longer available for purchase, but label data is preserved). Daily Value percentages shown below are based on FDA reference daily intake amounts for adults.
Product Details
- Type
- 🧬 Amino acid/Protein
- Form
- Capsule
- Database Entry Date
- 2016-01-25
- Ingredients
- 4
Supplement Facts (4 Ingredients)
How does L-Lysine compare?
Ingredients listed on each label, against the amino acid/protein category average of 12.7. Data from the NIH DSLD.
L-Lysine lists 16 ingredients fewer than 1 Up Whey Chocolate & Peanut Butter Blast. That is 9 below the amino acid/protein average.
What the Label Data Shows
According to NIH DSLD label rows, L-Lysine sits in the top 84% of products with a countable formula by declared ingredient count.
L-Lysine is a compact, 4-ingredient amino acid/protein supplement from Douglas Laboratories, sold in capsule form, cataloged in the NIH Dietary Supplement Label Database (DSLD). These ingredients span 4 nutrient categories, amino acid, protein, fiber, other, reflecting a multi-component formula rather than a single-nutrient product.
With only 4 ingredients on the label, 4 of 4 do not have a percentage Daily Value in this DSLD source record, which is not evidence that an FDA reference value does or does not exist.
A product's market status is worth checking before relying on this label. This product is currently listed as off-market in the DSLD, with its label first entered into the database on 2016-01-25. Once a product goes off-market, it is no longer manufactured or sold under this label, yet the DSLD keeps the record intact for historical reference, useful for researchers, anyone with an older bottle on hand, or tracking how formulations changed over time.
About the DSLD database
The DSLD is a label database, not an FDA approval list, under the 1994 DSHEA framework, dietary supplements do not require pre-market approval, and label information reflects what manufacturers self-declare rather than independent laboratory verification. This page presents factual label data for reference only and is not medical advice; consult a licensed healthcare provider before making decisions about any supplement.
Source: NIH Office of Dietary Supplements, Dietary Supplement Label Database (DSLD) Supplement label data for L-Lysine: ingredients, % Daily Value, market status, brand · 2026 DSLD captures manufacturer-self-declared label information; the NIH does not verify accuracy or evaluate safety/efficacy. Dietary supplements are regulated under DSHEA 1994, no pre-market FDA approval is required.
Nationwide supplements with similar label profiles
Two DSLD-derived peer sets for L-Lysine, both outside the Douglas Laboratories brand so the neighborhoods are not catalog containment (the same-type Nearby block above stays type-local).
Similar Capsule peers
Nearest same-form formulas from other brands.
Ingredient Breakdown by Category
Daily Value Coverage
Frequently Asked Questions
What ingredients are in L-Lysine? ▼
Who manufactures L-Lysine? ▼
Is L-Lysine still available for purchase? ▼
What is the serving size of L-Lysine? ▼
What type of supplement is L-Lysine? ▼
Data Sources & Methodology
Data as of 2025. Source: NIH Office of Dietary Supplements, Dietary Supplement Label Database (DSLD).
Supplement label data sourced from the Source: NIH Dietary Supplement Label Database (DSLD), maintained by the Office of Dietary Supplements at the National Institutes of Health. The DSLD contains label information from dietary supplement products marketed in the United States.
Daily Value (DV) percentages are based on Source: FDA 21 CFR 101.9 Reference Daily Intake (RDI) values for adults. Products marked "Off Market" may no longer be available for purchase but their label data remains in the database for reference.
Disclaimer, Not Medical Advice
Label data from the Source: NIH Dietary Supplement Label Database (DSLD). This information is for educational and reference purposes only and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before starting, stopping, or combining any dietary supplement, especially if you are pregnant, nursing, take prescription medication, or have a medical condition.
Read our methodology , how this data is sourced, computed, and verified.
Every figure on PlainVitamins is rendered directly from the NIH Dietary Supplement Label Database (DSLD), no number is typed in by an editor. This page draws directly on the NIH DSLD, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.