PlainVitamins

Optimized Carnitine

by Life Extension · capsule · 60 vegetarian capsules

  • On the market (NIH)
  • UPC 7 37870 20186 1
  • DSLD label 328611
  • Serving 2 vegetarian capsules
  • 30 servings

Optimized Carnitine by Life Extension lists 3 ingredients, 3 with an amount per serving of 2 vegetarian capsules, such as 800 mg of acetyl L carnitine hydrochloride, 300 mg of acetyl L-carnitine arginate dihydrochloride and 300 mg of glycine propionyl L-carnitine hydrochloride. Its current label entered the NIH Dietary Supplement Label Database on May 21, 2025.

What is in Optimized Carnitine?

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

Optimized Carnitine: Supplement Facts rows against the market (DSLD label 328611, January 2026 release)
IngredientAmount% DVAmong products listing it
Acetyl L Carnitine Hydrochloride800 mgAcetyl L-Carnitine in Optimized Carnitine against 933 products1,100 mg per serving; the middle half of products list 200 mg to 525 mg, the median 500 mg.1,100 mg

Higher than 95% of 933 products listing acetyl L-carnitine (median 500 mg). Per day at the most servings: 2,200 mg.

Acetyl L-Carnitine Arginate Dihydrochloride300 mg
Glycine Propionyl L-Carnitine Hydrochloride300 mg

Source: NIH ODS Dietary Supplement Label Database, label 328611 (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 1,100 mg of acetyl L carnitine hydrochloride (filed by NIH under acetyl L-carnitine) (2 rows of the label added together) is higher than 95% of the 933 acetyl L-carnitine products that print an amount; 42 list more.

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?

The products whose ingredient lists overlap most with Optimized Carnitine'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: Take two (2) capsules, once or twice daily, or as recommended by a healthcare practitioner. This product can be taken on an empty stomach with water or juice in the morning in divided doses or all at once.
Warnings
Read the entire label and follow the directions carefully prior to use.
Warnings: Do not exceed recommended dose. Do not purchase if outer seal is broken or damaged.
When using nutritional supplements, please consult with your physician if you are undergoing treatment for a medical condition or if you are pregnant or lactating.
To report a serious adverse event or obtain product information, contact 1-866-280-2852.
Allergens and what it does not contain
Gluten free Non GMO Le certified
Storage
Store tightly closed in a cool, dry place.

Source: label statements in DSLD label 328611.

What else is on the label?

Other ingredients: Cellulose, Stearate, Silica.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): Non GMO Le certified.

How many labels does Optimized Carnitine have?

4 labels are on file under this name since October 25, 2018: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 328611 (current) Entered May 21, 2025 · on the market · 60 vegetarian capsules · UPC 7 37870 20186 1
  2. Label 232634 Entered August 23, 2020 · on the market · 60 vegetarian capsules · UPC 7 37870 20186 1
  3. Label 210764 Entered December 22, 2019 · off the market July 14, 2020 · 60 vegetarian capsules · UPC 7 37870 20186 1
  4. Label 182265 Entered October 25, 2018 · off the market April 11, 2019 · 60 vegetarian capsules · UPC 7 37870 20186 1

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

Who makes it?

The label names Quality Supplements and Vitamins, Inc. (distributor), Ft. Lauderdale, FL. All Life Extension products.

Where next?