amino acid
D-phenylalanine supplements
Half of the 12 D-phenylalanine supplements in the NIH label database that print an amount list 375 mg or less per serving; the middle half list 131.5 mg to 500 mg (DSLD version 9.4.0, January 2026).
- Products listing it
- 1412 print an amount; 2 list it inside a blend without an amount
- Median per serving
- 375 mgmiddle half 131.5 mg to 500 mg
How much D-phenylalanine do supplements contain?
The median product lists 375 mg per serving. One in ten lists 34.9 mg or less, one in ten 500 mg or more. The amount printed most often is 500 mg (5 products).
Products by amount of D-phenylalanine per serving
12 products, log scale; extreme 0.2% at each end left out of the drawing.
| Amount per serving | Products | For example |
|---|---|---|
| 500 mg | 5 | Pure D-Phenyl-Relief (Montiff); EndorphiGen (Lidtke); D-Phenylalanine 500 mg (Doctor's Best) |
| 149 mg | 2 | Neuro-Natural General (Xtendlife); Neuro-Natural Serenity (Xtendlife) |
| 10 mg | 1 | Fibromyalgin (Cardiovascular Research) |
| 30 mg | 1 | Cephalgesic (Ecological Formulas) |
| 79 mg | 1 | Neuro-Natural Sleep (Xtendlife) |
| 250 mg | 1 | Vibrant Flora Peach Mango (Vibrant Health) |
| 700 mg | 1 | D-Phenylalanine (Holistic Healing Center) |
Source: Supplement Facts rows of every product's current label, NIH ODS Dietary Supplement Label Database version 9.4.0; amounts in one measure (weight).
Which products list the most D-phenylalanine?
On-market products, per serving, with a plausible amount: the rule leaves out likely entry slips, such as an amount far beyond every other label with no %DV or strength on the label to back it (each product page still shows its own amount, marked).
- D-PhenylalanineHolistic Healing Center700 mg
- Pure D-Phenyl-ReliefMontiff500 mg
- EndorphiGenLidtke500 mg
- D-Phenylalanine 500 mgDoctor's Best500 mg
- D-Phenyl-ReliefMontiff500 mg
- Vibrant Flora Peach MangoVibrant Health250 mg
- Neuro-Natural GeneralXtendlife149 mg
- Neuro-Natural SerenityXtendlife149 mg
In which products and brands?
Products listing D-phenylalanine by DSLD product type
Brands listing it most: Xtendlife (3), Doctor's Best (2), Montiff (2), Cardiovascular Research (1), Ecological Formulas (1), Vibrant Health (1), Lidtke (1), Holistic Healing Center (1).
Every product listing D-phenylalanine
14 products, A to Z by name (page 1 of 1), each with the amount its label prints; an amount far outside what other labels print is marked as a possible slip.
- Best D-PhenylalanineDoctor's Best · off the market500 mg
- CephalgesicEcological Formulas30 mg
- D-Phenyl-ReliefMontiff500 mg
- D-PhenylalanineHolistic Healing Center700 mg
- D-Phenylalanine 500 mgDoctor's Best500 mg
- EndorphiGenLidtke500 mg
- FibromyalginCardiovascular Research10 mg
- Hemotropin 2XCNutrabolicsin a blend
- Neuro-Natural GeneralXtendlife149 mg
- Neuro-Natural SerenityXtendlife149 mg
- Neuro-Natural SleepXtendlife79 mg
- Pure D-Phenyl-ReliefMontiff500 mg
- Reumofan PlusRiger Natural U.S.A. · off the marketin a blend
- Vibrant Flora Peach MangoVibrant Health250 mg