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DL-Phenylalanine Capsules

Equal blend of D and L forms to support dopamine synthesis, endorphin levels, mood, and comfort.

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DL-Phenylalanine Capsules

Equal blend of D and L forms to support dopamine synthesis, endorphin levels, mood, and comfort.

(1 Review) Write a Review

View All Reviews

Available in multiple forms! Click Here for:
  • Equal Blend D- and L-Phenylalanine
  • Supports Natural Dopamine Synthesis
  • Blocks Enkephalinase for Comfort
  • Easily Crosses Blood-Brain Barrier

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Updated On: 06/24/2026

$14.99

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Benefits

When You'll Notice Effects

2-3 Weeks (With Immediate Effects)

  • Mood
  • Cognition
  • Focus
  • Mental Energy

Why ND Dl-phenylalanine?

A dual-form amino acid with enkephalinase support for mood and comfort
test

How To Take

Dose
Dose

500mg (One Capsule)

Timing
Timing

Flexible

How to Take
How to Take

With Or Without Food

Frequency
Frequency

1 Time Daily

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  • About DL-Phenylalanine Capsules

    DL-Phenylalanine combines both forms of the essential amino acid phenylalanine into one supplement. The L-form serves as a precursor for dopamine synthesis, while the D-form blocks enkephalinase, the enzyme that breaks down endorphins. This dual mechanism supports both cognitive performance and supports comfort through enhanced neurotransmitter activity.

    Our DL-Phenylalanine Story

    Most supplements only provide L-phenylalanine, missing the unique benefits of the D-form. L-phenylalanine supports focus and motivation through dopamine pathways, while D-phenylalanine offers complementary endorphin support that's rarely available in standalone supplements.

    The equal 50:50 ratio delivers optimal benefits from both forms. L-phenylalanine crosses the blood-brain barrier to support neurotransmitter production, while D-phenylalanine inhibits enkephalinase activity to maintain healthy endorphin levels naturally. This combination creates a comprehensive approach to both cognitive enhancement and comfort support that single-form amino acids simply cannot match.

    Benefits

    • Supports Healthy Mood Balance: DL-Phenylalanine promotes natural endorphin activity by inhibiting enkephalinase, the enzyme that breaks down these compounds, creating sustained mood support beyond what exercise or stress relief alone can provide.
    • Supports Cognitive Function: The L-phenylalanine component serves as a direct precursor to neurotransmitter synthesis, helping maintain optimal levels of compounds essential for clear thinking and mental processing.
    • Supports Mental Focus And Clarity: By supporting dopamine production through its L-form while simultaneously preserving endorphins through its D-form, DL-Phenylalanine creates a balanced neurochemical environment that promotes sustained concentration.
    • Supports Mental Energy And Alertness: This essential amino acid combination helps maintain the neurochemical foundation for natural mental stamina without the peaks and crashes of stimulants.

    The D-phenylalanine component preserves endorphins that help maintain the body's natural response to physical comfort. This dual-action mechanism makes DL-Phenylalanine valuable for comprehensive wellness support that addresses both mental performance and physical well-being.

    Quality and Standardization

    • Lab-Tested Identity and Purity: Our DL-Phenylalanine undergoes comprehensive testing to verify both product identity and purity, ensuring you receive exactly what's stated on the label without unwanted contaminants.
    • Equal D and L-Form Ratio: We maintain a precise 50:50 ratio of D-Phenylalanine and L-Phenylalanine in our racemic mixture, providing consistent dual-pathway support for both neurotransmitter supplements and endorphin enhancement mechanisms.
    • Pharmaceutical Grade Standards: Our manufacturing process follows strict quality control protocols to ensure consistent capsule fill weights and potency across every batch.
    • Certificate of Analysis Available: Each production lot comes with detailed testing documentation covering heavy metals, microbiological contaminants, and amino acid profile verification for complete transparency.
    • Neutral pH Formulation: The electrically neutral nature of our DLPA formulation ensures optimal blood-brain barrier permeability for maximum bioavailability of both amino acid forms.

    Mechanism of Action

    • Dual Precursor Pathway: The L-phenylalanine component converts to tyrosine, which then becomes dopamine through hydroxylation and decarboxylation, providing the raw materials needed for neurotransmitter supplements synthesis in the brain.
    • Enkephalinase Inhibition: D-phenylalanine blocks the enkephalinase enzyme that normally degrades endorphins and enkephalins, allowing these natural opioid compounds to remain active longer for sustained mood and comfort support.
    • Blood-Brain Barrier Crossing: As an electrically neutral amino acid, DL-phenylalanine easily crosses the blood-brain barrier without competing with other amino acids for transport, ensuring efficient delivery to neural tissue where it can exert its dual effects.
    • Catecholamine Production: Beyond dopamine, the L-form supports the synthesis cascade that produces norepinephrine and epinephrine, contributing to alertness and energy levels through multiple catecholamine pathways.

    Overview of the Science

    DL-Phenylalanine provides a fascinating window into the body's natural neurotransmitter systems, where a single compound can influence both catecholamine and opioid pathways simultaneously [1]. As an electrically neutral amino acid, DL-phenylalanine easily crosses the blood-brain barrier, positioning itself at critical enzymatic junctions within central nervous system metabolism. The D-isomer's ability to selectively inhibit enkephalinase represents a unique mechanism among dietary supplements, effectively prolonging the half-life of naturally occurring endorphins without directly stimulating opioid receptors.

    Research suggests DL-phenylalanine supports comfort and physical ease through endorphin preservation. The compound's dual nature allows for comprehensive neurotransmitter support, with L-phenylalanine serving the catecholamine synthesis pathway while D-phenylalanine protects endogenous opioid peptides from enzymatic degradation. This creates a synergistic effect where both excitatory and inhibitory neurotransmitter systems receive targeted support through complementary biochemical mechanisms.

    [1] Fischer E, Heller B, Nachon M, Spatz H. Therapy of [...] by phenylalanine. Preliminary note. Arzneimittelforschung. 1975;25:132.

    Ingredients

    DL-Phenylalanine:

    • 500mg per capsule
    • Equal ratio of D-phenylalanine and L-phenylalanine
    • Pharmaceutical-grade amino acid compound

    The 500mg dosing provides an optimal amount of each phenylalanine form without oversaturating amino acid transport systems. This balanced approach ensures both D and L forms can effectively cross the blood-brain barrier and reach their respective target sites. Our pharmaceutical-grade sourcing guarantees molecular purity, which is critical for amino acids since even minor impurities can interfere with neurotransmitter supplements synthesis pathways and enkephalinase inhibition.

    LACTOSE FREE
    GLUTEN FREE
    NON-GMO
    VEGAN
  • Lab Testing Results / Certificate of Analysis (COA)

  • Frequently asked questions

    1. What's the best time of day to take DLPA?

      DL-Phenylalanine has flexible timing, so take it whenever fits your routine. It can be taken with or without food, once daily.

    2. How long does DLPA take to work?

      DL-Phenylalanine can produce immediate effects for some users, with full benefits typically developing over 2 to 3 weeks of consistent daily use.

    3. How does DL-Phenylalanine support mood?

      DL-Phenylalanine supports mood through two complementary pathways: the L-form drives dopamine synthesis, while the D-form inhibits enkephalinase, the enzyme that breaks down endorphins, prolonging their activity naturally.

    4. Does DLPA have side effects?

      DL-Phenylalanine is generally well-tolerated at the standard 500mg daily dose. Those sensitive to amino acids may notice mild digestive discomfort, and it should be avoided by anyone with phenylketonuria (PKU).

    5. Can I stack DLPA with Sabroxy?

      Yes, DL-Phenylalanine and Sabroxy can be stacked together. Both support dopamine pathways through complementary mechanisms, making them a popular pairing for focus and mood support.

    6. Why does Nootropics Depot use a 50:50 DLPA ratio?

      The 50:50 ratio ensures you get the full benefit of both isomers: the L-form drives dopamine synthesis for focus and motivation, while the D-form inhibits enkephalinase to preserve natural endorphin activity.

    7. Can DLPA cause irritability or mood swings?

      DL-Phenylalanine is generally well-tolerated, but some people are sensitive to compounds that influence dopamine and endorphin activity. If you notice any changes in mood, try taking it with food or reducing your dose.

    8. Can I take DLPA with coffee or caffeine?

      Yes, DL-Phenylalanine can be taken alongside caffeine. Both support dopamine-related pathways, so many people find the combination works well for focus and mental clarity.

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DL-Phenylalanine Capsules

DL-Phenylalanine Capsules

$14.99