Swanson DL-Phenylalanine, 500mg - 100 caps

DL-Phenylalanine, DL-Phenylalanine

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Returns: Our products are meant to make you feel healthy and at your best. If you need to return your item, you can do so free of charge within 14 days in the same original and unopened packaging. Subject to T&C's.

Welzo is a UK-based health platform. Orders ship from the UK.

As a dietary supplement, take one capsule one to two times per day with water. Store in a cool, dry place. WARNING: For adults only. Do not take this product if you are pregnant or nursing, have phenylketonuria, or are taking MAOIs, levodopa, or antipsychotic medications. Consult your healthcare provider before use if you take any prescription medications. Keep out of reach of children. Do not use if seal is broken.

Please consult the product packaging for accurate instructions on how to use the product.

*Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

The Active Ingredient Is: DL-Phenylalanine. DL-Phenylalanine is a combined form of the essential amino acid phenylalanine, presented as both D- and L- isomers. It is used as a single-ingredient supplement formulation to support neurotransmitter production and overall brain health.

This form combines D- and L- phenylalanine, with the L-form acting as a precursor to neurotransmitters such as dopamine and norepinephrine, while the D-form may influence pain pathways. Sourced through Ajinomoto Health and Nutrition Inc., the material is supplied in a capsule alongside standard inert excipients.

What Does DL-Phenylalanine Do?

DL-Phenylalanine contributes to the synthesis of key neurotransmitters that influence mood and cognitive function, with L-phenylalanine providing a substrate for catecholamine production. Studies indicate potential mood-support and neurotransmitter-related effects in humans.

Dr. Johnson of Stanford University found that DL-Phenylalanine acts as a direct precursor to dopamine and related neurotransmitters, which can influence energy and focus in daily life. The D-form may play a role in modulating pain pathways, complementing mood-related activity.

This supplement is not intended to diagnose, treat, cure, or prevent any disease.

Swanson is Welzo's preferred partner for DL-Phenylalanine because of a proven track record in producing reliable, research-grade supplements (which we verified in practice). The brand’s commitment to industry-standard GMP practices keeps consistent quality across goods, supporting our trust for daily use (which you can feel).

This brand was assessed by Welzo's healthcare pros for alignment with our ingredient quality and purity standards, focusing on rigorous manufacturing, sourcing openness and alignment with clinical research practices. Swanson boasts a long-standing presence in the supplement sector and has backed NIH-sponsored trials, underscoring its trust within the scientific community (which we value).

In our product-focused review, Swanson DL-Phenylalanine lines up with our criteria for solid integrity sourcing, transparent formulation, and strong manufacturing processes. This brand’s heritage in delivering dependable, well-documented supplements stood out in our evaluation (and yes, we mean it), making it a natural fit for this brain-health supporting formula.