# Phenibut **Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/phenibut **Data Source:** Hermetica Superfoods Ingredient Encyclopedia **Updated:** 2026-03-18 **Evidence Score:** 6 / 10 **Category:** Other **Also Known As:** β-Phenyl-γ-aminobutyric acid, 4-amino-3-phenylbutyric acid, Noofen, Fenibut, Citrocard, PhGABA, β-Phenyl-GABA ## Overview Phenibut (β-phenyl-GABA) is a synthetic derivative of GABA that crosses the blood-brain barrier to enhance GABAergic neurotransmission. It acts primarily on GABA-B receptors and voltage-gated calcium channels to produce anxiolytic and [nootropic](/ingredients/condition/cognitive) effects. ## Health Benefits - Reduces anxiety by mimicking GABA, which calms the nervous system and promotes relaxation. This is beneficial for stress management. - Enhances cognitive function by improving communication between neurons, leading to better memory and concentration. This supports mental performance. - Improves [sleep quality](/ingredients/condition/sleep) by modulating [neurotransmitter activity](/ingredients/condition/cognitive), which helps regulate sleep cycles. This is ideal for those with insomnia. - Supports mood stabilization by balancing [dopamine](/ingredients/condition/mood) levels, which can alleviate mood swings. This is crucial for emotional health. - Increases sociability by reducing social anxiety, which can enhance interpersonal interactions. This is beneficial for social settings. - Provides neuroprotection by reducing [oxidative stress](/ingredients/condition/antioxidant), which helps preserve brain health. This is important for long-term cognitive resilience. - Enhances [physical performance](/ingredients/condition/energy) by reducing fatigue, which allows for prolonged exercise and activity. This is ideal for athletes and active individuals. ## Mechanism of Action Phenibut binds to GABA-B receptors with high affinity, increasing inhibitory neurotransmission in the central nervous system. It also blocks voltage-gated calcium channels, particularly α2δ subunits, reducing excitatory [neurotransmitter release](/ingredients/condition/cognitive). The phenyl group enables blood-brain barrier penetration, unlike natural GABA. ## Clinical Summary Human studies on phenibut are limited, with most research conducted in Russia and Eastern Europe. Small clinical trials (20-50 participants) suggest anxiolytic effects at 250-750mg daily doses. Animal studies demonstrate improved stress tolerance and [cognitive performance](/ingredients/condition/cognitive), but large-scale randomized controlled trials are lacking. Evidence quality remains moderate due to limited Western research and potential publication bias. ## Nutritional Profile - Not naturally occurring; synthesized from GABA. - Typically available in powder or capsule form. - Often dosed in milligrams, with specific formulations for therapeutic use. ## Dosage & Preparation Typical dosage ranges from 250 mg to 1000 mg per day. Higher doses should be used with caution. Consult a healthcare provider before use. ## Safety & Drug Interactions Phenibut carries significant addiction potential with withdrawal symptoms including anxiety, [insomnia](/ingredients/condition/sleep), and seizures after regular use. It enhances effects of alcohol, benzodiazepines, and other CNS depressants, creating dangerous sedation risks. Common side effects include drowsiness, nausea, and dizziness at doses above 1g daily. Pregnant and breastfeeding women should avoid phenibut due to unknown fetal effects and GABA system interference. ## Scientific Research Phenibut has been studied in various clinical settings, primarily in Russia, with some human trials indicating its efficacy for anxiety and sleep disorders. However, comprehensive RCTs in Western countries are limited. ## Historical & Cultural Context Phenibut was first introduced in the Soviet Union as a treatment for anxiety and stress, and was even included in the Russian cosmonaut medical kits for its calming effects. ## Synergistic Combinations L-Theanine, Ashwagandha, Rhodiola Rosea ## Known Interactions | Substance | Severity | Summary | URL | |---|---|---|---| | Kratom | MAJOR | Phenibut and Kratom — CONTRAINDICATED (Synergistic CNS/Respiratory Depression) | https://ingredients.hermeticasuperfoods.com/interactions/kratom | | Serrapeptase | SAFE | Serrapeptase and Phenibut — No Known Interaction | https://ingredients.hermeticasuperfoods.com/interactions/serrapeptase | | Tianeptine | SAFE | Phenibut and Tianeptine — No Known Interaction | https://ingredients.hermeticasuperfoods.com/interactions/tianeptine | | Black Walnut Hull | SAFE | Phenibut and Black Walnut Hull — No Known Interaction | https://ingredients.hermeticasuperfoods.com/interactions/black-walnut-hull | | Wormwood | SAFE | Phenibut and Wormwood — No Known Interaction | https://ingredients.hermeticasuperfoods.com/interactions/wormwood | | Clove Oil | SAFE | Phenibut and Clove Oil — No Known Interaction | https://ingredients.hermeticasuperfoods.com/interactions/clove-oil | | Tea Tree Oil | SAFE | Phenibut and Tea Tree Oil — No Known Interaction | https://ingredients.hermeticasuperfoods.com/interactions/tea-tree-oil | | Colloidal Silver | SAFE | Phenibut and Colloidal Silver — No Known Interaction | https://ingredients.hermeticasuperfoods.com/interactions/colloidal-silver | | Nattokinase | SAFE | Phenibut and Nattokinase — No Known Interaction | https://ingredients.hermeticasuperfoods.com/interactions/nattokinase | | Lumbrokinase | SAFE | Phenibut and Lumbrokinase — No Known Interaction | https://ingredients.hermeticasuperfoods.com/interactions/lumbrokinase | | Wobenzym | SAFE | Phenibut and Wobenzym — No Known Interaction | https://ingredients.hermeticasuperfoods.com/interactions/wobenzym | | Monolaurin | SAFE | Phenibut and Monolaurin — No Known Interaction | https://ingredients.hermeticasuperfoods.com/interactions/monolaurin | | Turkesterone | SAFE | Phenibut and Turkesterone — No Known Interaction | https://ingredients.hermeticasuperfoods.com/interactions/turkesterone | | Fadogia Agrestis | SAFE | Phenibut and Fadogia Agrestis — No Known Interaction | https://ingredients.hermeticasuperfoods.com/interactions/fadogia-agrestis | | Cistanche | SAFE | Phenibut and Cistanche — No Known Interaction | https://ingredients.hermeticasuperfoods.com/interactions/cistanche | | Apigenin | SAFE | Phenibut and Apigenin — No Known Interaction | https://ingredients.hermeticasuperfoods.com/interactions/apigenin | | Emodin | SAFE | Phenibut and Emodin — No Known Interaction | https://ingredients.hermeticasuperfoods.com/interactions/emodin | | Sea Moss | SAFE | Phenibut and Sea Moss — No Known Interaction | https://ingredients.hermeticasuperfoods.com/interactions/sea-moss | | Spermidine | SAFE | Phenibut and Spermidine — No Known Interaction | https://ingredients.hermeticasuperfoods.com/interactions/spermidine | | Urolithin A | SAFE | Phenibut and Urolithin A — No Known Interaction | https://ingredients.hermeticasuperfoods.com/interactions/urolithin-a | ## Frequently Asked Questions ### What is the recommended phenibut dosage for anxiety? Clinical studies suggest 250-500mg taken 1-2 times daily for anxiety relief. Beginners should start with 250mg to assess tolerance, as higher doses increase dependency risk and side effects. ### How long does phenibut take to work? Phenibut typically takes 2-4 hours to reach peak effects due to slow absorption and blood-brain barrier crossing. Effects can last 15-24 hours, which contributes to its addiction potential with frequent dosing. ### Can you take phenibut daily safely? Daily phenibut use is not recommended due to rapid tolerance development and severe withdrawal symptoms. Most experts suggest limiting use to 2-3 times per week maximum to prevent physical dependence. ### What are phenibut withdrawal symptoms? Phenibut withdrawal includes severe anxiety, insomnia, tremors, and potentially life-threatening seizures after 3-7 days of cessation. Symptoms can last 2-4 weeks and often require medical supervision for safe discontinuation. ### Is phenibut legal in the United States? Phenibut remains legal as a dietary supplement in the US but is banned in several countries including Australia and Italy. The FDA has issued warnings about phenibut products and removed some from the market due to safety concerns. ### Does phenibut interact with alcohol or other depressants? Phenibut should not be combined with alcohol or other central nervous system depressants (benzodiazepines, opioids, etc.) as it significantly increases the risk of excessive sedation, respiratory depression, and dangerous side effects. Both phenibut and these substances work on similar GABA pathways, creating a compounding effect that can be harmful. Always inform healthcare providers about phenibut use before taking other medications or consuming alcohol. ### Who should avoid phenibut supplementation? Phenibut should be avoided by pregnant or breastfeeding women, individuals with a history of substance abuse or addiction, and those with severe liver or kidney disease. People taking medications that affect the central nervous system, such as antidepressants or sleep aids, should consult a healthcare provider before use. Additionally, those sensitive to GABA-mimicking compounds may experience adverse reactions. ### What does clinical research say about phenibut's effectiveness for cognitive enhancement? Clinical research on phenibut's cognitive effects is primarily from Eastern European studies and shows mixed but promising results for memory consolidation and mental performance under stress. Studies suggest it may improve focus and learning ability by enhancing neuronal communication, though the evidence base is smaller compared to other nootropics. More rigorous, large-scale Western studies are needed to fully establish its efficacy and optimal use protocols for cognitive enhancement. --- *Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com* *License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*