• Pure D-phenylalanine
  • Pain & mood
  • Essential amino acid
  • 500 mg per capsule
  • 60 vegetable capsules
Out of stock
EUR 25.25
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D-Phenylalanine by Doctor's Best

D-phenylalanine is an essential 'non-protein' amino acid responsible for various bodily biochemical processes. The amino acid is the precursor of the brain neurotransmitters dopamine, adrenaline and norepinephrine. Phenylalanine can be considered a nootropic.

Phenylalanine explained

Phenylalanine comes in two different forms. The natural form occurs in food and is more specifically called L-phenylalanine. D-phenylalanine is the synthetic form that comes very close to the natural form. Most amino acids come in two enantiomers (mirror image molecules): in an L- (laevo = left) and in a D-structure (dextro = right). Both forms have unique properties and different effects in the body.


  • Natural, essential 'non-protein' amino acid
  • Converts to phenylethylamine
  • Precursor of dopamine, adrenaline and norepinephrine
  • Necessary for various bodily processes
  • Does not contain gluten or soy; GMO-free
  • Suitable for vegans and vegetarians

About Doctor's Best

Doctor's Best was founded in 1990 by a physician interested in wholesome nutrition answering to scientific perspectives. The company has produced already over 200 state-of-the-art nutritional supplements. All products contain branded raw materials and are thoroughly tested at every step of the production process, from raw material to finished product. during the manufacture of products the company comprehensively applies Guidelines for Current Good Manufacturing Practice (cGMP). Doctor's Best collaborates with nutrition scientists around the world to find superior ingredients that have been well researched. This leads to high-quality end products reflecting the latest scientific insights.

Standardized brand products

In its products Doctor's Best almost exclusively uses proprietary and standardized brand materials of official trademarks that have been extensively researched. The authenticity of these ingredients is guaranteed in all products. Doctor's Best never uses alternatives. This results in a qualitatively superior line of supplements with exceptionally high bioavailability.

More Information
Product Name
Doctors Best
60 capsules
User Instructions

Take 1 capsule daily on an empty stomach at least 20 minutes before a meal, or as recommended by a healthcare practitioner. To ensure optimal absorption of phenylalanine, avoid taking other amino acid supplements within 2-3 hours after consumption. Caution: Phenylalanine supplements should not be taken by children, pregnant or breastfeeding women, people with phenylketonuria (PKU), high blood pressure, or who are taking antipsychotics or MAOIs. Consult your doctor before use.

Ingredients per Serving

500 mg D-phenylalanine.

EU Norm
*RDA = Recommended Daily Allowance
Other Ingredients

Modified cellulose (vegetarian capsule), microcrystalline cellulose, magnesium stearate (vegetable source).

Vegan, Vegetarian
Storage: see label. Keep out of the reach of children. Consult an expert before use in case of pregnancy, breastfeeding, illness or medication.
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