US residents who have mental health issues sign the informed consent form and are screened and enrolled for this study. Participants who are enrolled complete a survey upon enrollment and are randomized into one of three arms. This study is direct to participant and will NOT utilize clinical sites.

Participants who meet the eligibility criteria are randomized into any of the three arms including: the control arm, VIOME's condition-based supplements (VCS) arm or the VIOME Precision Nutrition Program (VPNP) arm.

Placebo, Viome-designed condition-based supplements and Viome's Precision Nutrition Program include supplements, may include dietary recommendations towards improving the symptoms associated with mental health. The trial will last approximately 4 months for each participant.

Inclusion Criteria:

• Resident of the United States
• Females and males ages 25-75 (inclusive)
• Able to speak and read English
• No unexplained weight loss, fevers, anemia, or blood in stool
• Willing and able to follow the trial instructions, as described in the recruitment letter
• Signed and dated informed consent prior to any trial-specific procedures.
• PHQ9 score of 5-24 (inclusive)

Exclusion criteria

• Unwilling to change their current diet

• Prior use of Viome products or services

• Antibiotic use in the previous 4 weeks

• Pregnancy (current or planned in the next 4 months)

• < 90 days postpartum

• Breast feeding

• Active infection

• Unable or unwilling to use Viome's App on an iPhone or Android smartphone

• Significant diet or lifestyle change in the previous 1 month

• IBD diagnosis -Major psychiatric/DSM-4 disease diagnosis (e.g. Schizophrenia, Bipolar disorder, Post- traumatic Stress Disorder, Obsessive Compulsive disorder)

• Use of investigational drugs, products or devices within 1 month prior to and 4 months after the start of the trial

• Cancer therapy within the previous 1 year

• Major surgery in the last 6 months or planned in the next 4 months

• Allergies to any supplement ingredients listed in the screening survey

• Currently on a specific diet: FODMAP, KETO, PALEO

• Answered yes to the question, "In the past few weeks, have you wished you were dead or had thoughts about killing yourself?"

• Gastrointestinal disease including:

  • GI surgery except:

    • Appendectomy and benign polypectomy

• Esophagitis

• Celiac disease

• GI malignancy or obstruction

• Peptic Ulcer Disease

• Duodenal or gastric ulcer disease

Once enrolled, participants are randomized into one of the three arms. The coded supplements with blinded labels are shipped to the participants. The participants are not aware of which group they are randomized into.