Doctor's Best D-Phenylalanine, 500mg - 60 vcaps

D-Phenylalanine 500mg, Modified cellulose (vegetarian capsule), Cellulose, Magnesium stearate (vegetable source).

United Kingdom & Rest of the World Shipping Details:
Same day dispatch for orders placed by 2pm (Orders after 2pm dispatched next working day).

Free shipping on orders over £50 to the UK.

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.

Take 1 or 2 capsules daily, between meals, or as recommended by a nutritionally informed physician. Store in a cool, dry place. Phenylalanine supplements should not be taken by individuals with phenylketonuria (PKU), children, pregnant or lactating women, people with high blood pressure, and anyone taking anti-psychotic medications or MAO inhibitors.

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

Serving Size	1 Capsule
Calories	0
Total Fat	0g
Saturated Fat	0g
Trans Fat	0g
Cholesterol	0mg
Sodium	0mg
Total Carbohydrate	0g
Dietary Fiber	0g
Sugars	0g
Protein	0g
D-Phenylalanine	500mg

The Active Ingredient Is: D-Phenylalanine

D-Phenylalanine is a non-protein amino acid involved in normal neurotransmitter function related to mood and pain pathways.

This formulation presents D-Phenylalanine in a capsule alongside inert excipients; the ingredient is described as the active component responsible for supporting endorphin and enkephalin activity without referencing additional active formulation components.

What Does D-Phenylalanine Do?

Scientific research suggests that D-Phenylalanine slows the action of enzymes that break down endorphins and enkephalins, helping to maintain higher levels of these endogenous peptides.

In line with EFSA-style function claims, this mechanism plays a role in supporting the normal regulation of mood and comfort-related pathways through modulation of body peptides.

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

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

Doctor's Best is a well respected, science‑based brand in the supplement world, known for delivering transparent, research‑backed formulations. This brand has been carefully reviewed by our expert team of doctors, nurses, and nutritionists for alignment with Welzo's standards, and we are confident in Doctor's Best as a reliable partner for this amino acid product. The product itself concentrates on a clearly defined active ingredient—D‑phenylalanine—with a 500 mg per capsule dosage, supported by vegetarian capsule shells and inert additives, reflecting a straightforward, purity‑driven approach that matches our brand expectations. Our team prioritises brands with a transparent, science‑led approach to ingredient selection and dosing, and Doctor's Best meets these criteria through its clear formulation strategy and dosage clarity. This brand's selection is reinforced by our quality certification process, which ensures rigorous review of ingredients and manufacturing practices as part of our vetting.