Silver Fir Safety in Healthy Volunteers

Inclusion Criteria: * Healthy adult volunteers * Age 37-55 years * Both sexes (male and female) * Willingness to comply with study protocol and attend all study visits * Signed informed consent Exclusion Criteria: * Known acute or chronic illness * Use of any medications other than occasional analgesics (none were used by participants) * Use of dietary supplements prior to or during the study * Known mental illness (e.g., depression, psychosis, severe alcoholism, drug abuse) * Consumption of more than 2 alcohol units per day (20 g ethanol, equivalent to \~2 dl wine, 5 dl beer, or 0.3 dl brandy) * Participation in other research studies concurrently