D-Phenylalanine 500 mg
by Doctor's Best · capsule · 60 veggie caps
- On the market (NIH)
- UPC 7 53950 00110 7
- DSLD label 269337
- Serving 1 veggie capsule
- 60 servings
D-Phenylalanine 500 mg by Doctor's Best lists one ingredient: 500 mg of D-phenylalanine per serving of 1 veggie capsule. Its current label entered the NIH Dietary Supplement Label Database on June 16, 2022.
What is in D-Phenylalanine 500 mg?
Each row as the label prints it, per serving of 1 veggie capsule. 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 |
|---|---|---|---|
| D-Phenylalanine | 500 mg |
Source: NIH ODS Dietary Supplement Label Database, label 269337 (entered June 16, 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?
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?
4 products list the very same ingredients; the nearest amounts come first.
- Best D-PhenylalanineDoctor's Best · off the market same ingredients
- Pure D-Phenyl-ReliefMontiff same ingredients
- D-Phenyl-ReliefMontiff same ingredients
- D-PhenylalanineHolistic Healing Center same ingredients
- EndorphiGenLidtke 1 shared, 67% 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 Adult Use: Take 1 capsule daily on an empty stomach at least 20 minutes before meals, or as recommended by a nutritionally-informed physician. To ensure optimal phenylalanine absorption, avoid taking other amino acid supplements within 2-3 hours of consumption.
- Warnings
- Warning: Phenylalanine supplements should not be taken by children, pregnant, nursing, individuals with phenylketonuria (PKU), high blood pressure, taking anti-psychotic medications or MAO inhibitors. Consult your physician before use.
- Warning: Phenylalanine supplements should not be taken by children, pregnant, nursing, individuals with phenylketonuria (PKU), high blood pressure, taking anti-psychotic medications or MAO inhibitors.
- Allergens and what it does not contain
- Non-GMO Gluten Free Soy Free
- Storage
- Store in a cool dry place.
Source: label statements in DSLD label 269337.
What else is on the label?
Other ingredients: Hypromellose, Microcrystalline Cellulose, Magnesium Stearate.
How many labels does D-Phenylalanine 500 mg have?
2 labels are on file under this name since July 24, 2019: other sizes, label designs and reformulations. The current one leads this page.
- Label 269337 (current) Entered June 16, 2022 · on the market · 60 veggie caps · UPC 7 53950 00110 7
- Label 202850 Entered July 24, 2019 · off the market November 23, 2021 · 60 veggie caps · UPC 7 53950 00110 7
DSLD also links this label to: Best D-Phenylalanine (image difference, same product), Best D-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 Doctor's Best, Inc. (distributor), California. All Doctor's Best products.