Safety and Psychological Effects of Psilocybin and D-Serine Formulation in Healthy Volunteers

Summary

The goal of this open-label, dose-escalation, prospective study is to evaluate the safety and psychological effects of a Psilocybin and D-Serine formulation in healthy volunteers.

The main objectives are:

1. To assess the psychological and physiological effects of psilocybin administered with D-Serine in healthy adults.
2. To determine whether D-Serine modulates or attenuates the psychedelic effects of psilocybin.
3. To evaluate the safety and tolerability of psilocybin and D-Serine co-administration.

Study population includes: 10 healthy male or female volunteers aged 25-60 years with no history of psychiatric or major medical disorders and no current evidence of such disorders.

The study includes two cohorts. The first cohort of 5 participants will receive 15 mg of Psilocybin and 5 g of D-Serine. Safety data will be collected and submitted in an interim report to the Ethics Committee. If no safety concerns arise, the second cohort will receive an increased dose of 25 mg of Psilocybin and 7 g of D-Serine to help determine the optimal dose for a future Phase IIa clinical trial.

Conditions

• Healthy Volunteers

Interventions

DRUG

Psilocybin and D-Serine

A single administration of the drug, with dosage divided as follows: Cohort 1: 15 mg of Psilocybin and 5 gr of D-Serine Cohort 2: 25 mg of Psilocybin and 7 gr of D-Serine

DIAGNOSTIC_TEST

Physical Examination

The physical examination will include diagnosis and documentation of any significant clinical abnormalities or diseases. It will be performed during the baseline rating visit (preparation phase).

DIAGNOSTIC_TEST

Vital signs

Vital sign measurements (blood pressure, pulse, and oxygen saturation) will be taken at screening, preparation, baseline rating, administration day, day 2, day 28, and day 84. Vital signs will be assessed at the following time points on the administration day and on day 2: pre-administration, and at 0.5, 1, 2, 3, 4, 6, 8, 12, 16, 20, and 24 hours post-administration.

DIAGNOSTIC_TEST

ECG test

A 12-lead ECG will be performed to rule out underlying cardiac abnormalities. An ECG will be conducted for each patient during the screening and Day 2 visits.

DIAGNOSTIC_TEST

Comprehensive Blood Panel

A comprehensive blood panel will be performed to assess kidney and liver function, electrolyte balance, and glucose levels. It will be conducted during the Screening visit, and on Day 2, Day 28, and Day 84.

DIAGNOSTIC_TEST

Complete Blood Count

Complete Blood Count will be performed to check for hematological abnormalities. It will be conducted during the Screening visit, and on Day 2, Day 28, and Day 84.

DIAGNOSTIC_TEST

Urinalysis

Urinalysis will be conducted during the Screening visit, and on Day 2, Day 28, and Day 84.

DIAGNOSTIC_TEST

Urine Toxicology Screen

Urine Toxicology Screen will be performed to rule out illicit drug use. It will be conducted during the Screening visit, and on Day 2, Day 28, and Day 84.

DIAGNOSTIC_TEST

A pregnancy Urine test

A urine pregnancy test will be performed for women of childbearing potential only. It will be conducted during the screening and baseline rating visits. If the urine test is positive, a serum β-hCG test will be performed for confirmation.

DIAGNOSTIC_TEST

Electroencephalogram

EEG will be performed during the baseline rating scale and Day 7 visits to evaluate brain activity

DIAGNOSTIC_TEST

Plasma Amino Acid Levels

The following blood test parameters - D-Serine, L-Serine, and Glycine - will be assessed during the Screening and Day 28 visits.

DIAGNOSTIC_TEST

Plasma Inflammation Markers

The following blood test parameters - Tumor Necrosis Factor Alpha (TNF-α), Interleukin-6 (IL-6), and C-Reactive Protein (CRP) - will be assessed during the Screening and Day 28 visits.

DIAGNOSTIC_TEST

Plasma Brain-Derived Neurotrophic Facto

Plasma BDNF (Brain-Derived Neurotrophic Factor) levels will be measured during the screening and Day 28 visits.

OTHER

Mini International Neuropsychiatric Interview

The Mini International Neuropsychiatric Interview (MINI) will be administered during the screening visit to rule out any current or past major psychiatric disorders.

OTHER

Family Psychiatric History Assessment

The Family Psychiatric History Assessment (FPHA) will be administered during the screening visit to help rule out any current or past major psychiatric disorders.

OTHER

Beck Depression Inventory

The Beck Depression Inventory (BDI) will be administered at the following visits: screening, baseline, day 7, day 28, and day 84. It will be used to assess baseline mood and to rule out depressive symptoms.

OTHER

State-Trait Anxiety Inventory

State-Trait Anxiety Inventory (STAI) will be administered at the following visits: screening, baseline, day 7, day 28, and day 84. It will be used to screen for anxiety disorders.

BEHAVIORAL

Profile of Mood States

The Profile of Mood States (POMS) will be administered to assess baseline mood and emotional state. It will be administered at the following visits: screening, baseline, administration day, day 2, day 7, day 28, and day 84. On the administration day and on day 2, it will be administered at the following time points: pre-administration, and 8 and 20 hours post-administration.

BEHAVIORAL

Subjective Units of Distress Scale

Subjective Units of Distress Scale (SUDS) will be administered to assess anxiety and stress levels. It will be administered at the following visits: screening, baseline, administration day, day 2, day 7, day 28, and day 84. On the administration day and on day 2, it will be administered at the following time points: pre-administration, and 8 and 20 hours post-administration.

OTHER

Five-Dimensional Altered States of Consciousness questionnaire

The Five-Dimensional Altered States of Consciousness questionnaire (5D-ASC) will be used to assess the acute subjective psychedelic experience. It will be administered after the acute effects have subsided - at 6.0 hours post-administration on the administration day, and again on day 2 - to evaluate five key experiential dimensions: visual restructuralization, oceanic boundlessness, reduction of vigilance, anxious ego dissolution, and auditory alterations. Each item will be rated using a Visual Analogue Scale (VAS) ranging from "NO, not more than usually" (0 mm) to "YES, much more than usually" (100 mm).

BEHAVIORAL

Integration

The integration process is conducted to support participants in processing and incorporating their therapeutic experience into daily life, with the aim of enhancing emotional insight and psychological well-being. Integration will take place at the following visits: 8.0 hours post-treatment on the administration day, day 2, day 7, day 28, and day 84.

Sponsors & Collaborators

• Hadassah Medical Organization

  lead OTHER

Study Design

Allocation

NON_RANDOMIZED

Purpose

TREATMENT

Masking

NONE

Model

SEQUENTIAL

Eligibility

Min Age

25 Years

Max Age

60 Years

Sex

ALL

Healthy Volunteers

Yes

Timeline & Regulatory

Start

2025-12-11

Primary Completion

2026-11-30

Completion

2027-02-28

Countries

• Israel

Study Locations