L-Phenylalanine 500 mg
by Source Naturals · tablet or pill · 100 tablets
- On the market (NIH)
- UPC 0 21078 00161 4
- DSLD label 272407
- Serving 1 to 2 tablets; amounts per 2 tablets
- 50 servings
L-Phenylalanine 500 mg by Source Naturals lists 2 ingredients, 2 with an amount per serving of 2 tablets, such as 99 mg of calcium and 1 g of L-phenylalanine. Its current label entered the NIH Dietary Supplement Label Database on August 23, 2022.
What is in L-Phenylalanine 500 mg?
Each row as the label prints it, per serving of 2 tablets. 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 |
|---|---|---|---|
| Calcium | 99 mg | 10% | 58% of 17,831 products listing calcium give more (median 115 mg). |
| L-Phenylalanine | 1 g | Higher than 91% of 611 products listing phenylalanine (median 250 mg). |
Source: NIH ODS Dietary Supplement Label Database, label 272407 (entered August 23, 2022), 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 1,000 mg of L-phenylalanine (filed by NIH under phenylalanine) is higher than 91% of the 611 phenylalanine products that print an amount; 46 list more.
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?
1 product lists the very same ingredients; the nearest amounts come first.
- L-PhenylalanineSource Naturals · off the market same ingredients
- L-Phenylalanine 500 mgVitamin World 1 shared, 72% alike
- L-PhenylalaninePureBulk.com 1 shared, 72% alike
- Pure L-Phenylalanine Free Form Amino PowderHARD RHINO 1 shared, 72% alike
- L-Phenylalanine 500 mgThompson 1 shared, 72% alike
- L-PhenylalanineNutraBio · off the market 1 shared, 72% alike
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 to 2 tablets daily.
- Warnings
- Do not use if either tamper-evident seal is broken or missing.
- Keep out of the reach of children.
- Warning: Contains phenylalanine.
- Not to be used by phenylketonurics, women who are pregnant, may become pregnant, or breastfeeding, or with antidepressant drugs such as MAOIs or SSRIs.
- If you have chronic high blood pressure, take after meals and/or consult your health care professional.
- Allergens and what it does not contain
- Suitable for Vegetarians and Hypoallergenic: Contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contains no sugar, starch, salt, preservatives, or artificial color, flavor or fragrance.
Source: label statements in DSLD label 272407.
What else is on the label?
Other ingredients: Dibasic Calcium Phosphate, Stearic Acid, Silica, modified Cellulose Gum, Magnesium Stearate.
How many labels does L-Phenylalanine 500 mg have?
One label is on file, entered on August 23, 2022.
- Label 272407 (current) Entered August 23, 2022 · on the market · 100 tablets · UPC 0 21078 00161 4
DSLD also links this label to: L-Phenylalanine (image difference, same product).
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.