Mental health support
Reduces anxiety, depression, and panic disorders
Vitamin B8 (Inositol)
Essential nutrient for cellular signaling, mental health, and metabolic function
Scientific nameMyo-Inositol
FormulaC6H12O6
Molecular weight180.16 g/mol
CAS87-89-8
95
absorption score
9
safety / 10
40
USD per month
5
documented interactions
Check it against something
Vitamin B8 (Inositol) with:
- Amylase
- Ashwagandha
- Avocado Oil
- BCAA (Branched-Chain Amino Acids)
- Beetroot Powder
- Beta-Alanine
- Bifidobacterium lactis
- Bifidobacterium longum
- Bovine Collagen
- Caffeine
- Calcium
- Calcium Bone Formula
- Calcium Carbonate
- Casein Protein
- Chicken Collagen
- Choline (Bitartrate)
- Chondroitin Sulfate
- Coconut Oil
- Collagen Peptides
- Comprehensive Immune Support Complex
- Comprehensive Multivitamin-Mineral Complex
- Creatine HCL
- Creatine Monohydrate
- D-Mannose
- DHA
- Electrolyte Blend
- EPA
- Fish Oil (EPA/DHA)
- Folate (5-MTHF)
- Ginger
- Iron Fumarate
- Iron Sulfate
- Joint Mobility Formula
- Keratin
- Krill Oil
- L-Carnitine
- L-Citrulline
- Lactase
- Lactobacillus acidophilus
- Lactobacillus rhamnosus
- Lipase
- Magnesium Citrate
- Magnesium Glycinate
- Magnesium Oxide
- Marine Collagen
- Melatonin
- Modafinil
- Olive Oil Extract
- Omega-3 + Curcumin + Vitamin D Triple Anti-Inflammatory Formula
- Papain
- Protease
- Saccharomyces boulardii
- Turmeric
- Vitamin B12 (Cyanocobalamin)
- Vitamin B12 (Methylcobalamin)
- Vitamin C (Ascorbic Acid)
- Vitamin C (Sodium Ascorbate)
- Vitamin D3
- Whey Protein
- Zinc Gluconate
Nothing found
98
out of 100
Works better together
Compatible. Timing differs, so follow each supplement's own window.
What it does
mechanism and evidence for each claimPCOS and fertility support
Improves insulin sensitivity and ovarian function in PCOS
Obsessive-compulsive disorder relief
Reduces OCD symptoms and compulsive behaviors
Metabolic syndrome improvement
Enhances insulin sensitivity and glucose metabolism
Cellular membrane health
Essential component of cellular membranes and signaling
Others take these for the same thing
Same goal, different mechanism — check any of them against this one
Vitamin B12 (Cyanocobalamin)
Energy & nerve support
250-1000 mcg
A
70%
Fish Oil (EPA/DHA)
Heart & brain health
1-2g EPA/DHA
A
85%
L-Theanine
Calm focus & stress relief
100-400mg
B
90%
SAM-e
Mood support & liver health
400-800mg
A
70%
Lithium Orotate
Mood & brain support
1-20mg
C
60%
Lithium
Mood balance & neuroprotection
1-5 mg
C
80%
Every pair we checked
12 combinations scored by the engine
Vitamin B8 (Inositol) + Berberine for Advanced Glucose Control and Metabolic Support
High glucose increases inositol excretion
Needs attention
58
Vitamin B8 (Inositol) + Caffeine
High caffeine may counteract anti-anxiety effects
Needs attention
58
Vitamin B8 (Inositol) + Creatine Monohydrate
No documented interaction either way
No known interaction
70
Vitamin B8 (Inositol) + Whey Protein
No documented interaction either way
No known interaction
70
Vitamin B8 (Inositol) + Vitamin D3
Prevents arterial calcification from vitamin D
Works better together
78
Vitamin B8 (Inositol) + Vitamin B8 (D-Chiro-Inositol)
Synergistic for PCOS and insulin sensitivity
Works better together
82
Vitamin B8 (Inositol) + Lactase
Improved calcium absorption when consuming dairy
Works better together
82
Vitamin B8 (Inositol) + Bovine Collagen
Essential for collagen synthesis and cross-linking
Works better together
82
Vitamin B8 (Inositol) + DHA
Prevents oxidation of DHA and enhances stability
Works better together
82
Vitamin B8 (Inositol) + Magnesium Oxide
Both support insulin sensitivity and mood
Works better together
90
Vitamin B8 (Inositol) + Calcium Carbonate
Essential for calcium absorption and utilization
Works better together
94
Vitamin B8 (Inositol) + Choline (Bitartrate)
Both support membrane phospholipid synthesis
Works better together
98
Dosage
Daily2-18g (condition dependent)
Pcos fertility2-4g daily
Mental health12-18g daily
Metabolic support2-6g daily
Maintenance500mg-2g daily
Before you take it
VeganYes
When to expect it
First Effects2-4 weeks for mood and anxiety improvements
Peak Benefits8-16 weeks for PCOS, OCD, and metabolic benefits
Deficiency DevelopmentWeeks to months (body produces some inositol)
Toxicity OnsetRare, mainly digestive upset at very high doses
How to measure it
MarkerSerum inositol or insulin sensitivity markers
OptimalVariable, higher levels generally beneficial
FrequencyEvery 3-6 months if using for PCOS or metabolic conditions
What people actually reported to the FDA
CAERS, 0 reports naming it as the suspect
Named as the suspect
0 reports
of 1 that mention it at all
Reports are voluntary and unverified — they record what someone experienced while taking something, not what the compound caused. Counts skew towards products people take a lot of, and a serious outcome is more likely to be reported than a mild one, so these are not rates. How we filter them →
What actually reaches you
The label counts the carrier, your body does not
Absorption
Very high 95 of 100 · best absorbed form of this compound
Delivered daily
9500 mg
Cost per 100 mg delivered
$0.01 comparative — uses the absorption score, not a measured percentage
Works better with
+
D Chiro Inositol
Synergistic for PCOS and insulin sensitivity
Both forms work together in insulin signaling · level A
+
Choline
Both support membrane phospholipid synthesis
Complementary roles in phospholipid metabolism · level B
+
Magnesium
Both support insulin sensitivity and mood
Complementary roles in cellular signaling · level BWhat not to take with Vitamin B8 (Inositol)
!
Caffeine Excess
High caffeine may counteract anti-anxiety effects
Opposing effects on anxiety and neurotransmitters · mild significance
!
Glucose Excess
High glucose increases inositol excretion
Glucose competes with inositol for renal reabsorption · moderate in diabetics significanceMedication interactions
Discuss these with a pharmacist before combiningInositol may reduce lithium effectiveness
What to do: Consult psychiatrist before combining
May enhance antidepressant effects
What to do: Monitor for enhanced effects
May enhance glucose control
What to do: Monitor blood glucose for improvements
Available forms
Myo-Inositol: Well-studied, High safety, Multiple benefits, Natural compound
Food sources
Cantaloupe
355mg per cup · 95
Citrus fruits
200-300mg per fruit · 90
Beans and legumes
100-600mg per cup · 85
Whole grains
100-300mg per serving · 80
Too little
- Insulin resistance and glucose intolerance
- Anxiety and depression
- Hair loss and alopecia
- Fatty liver development
- Poor cellular signaling
- Metabolic dysfunction
Too much
- Very rare and mild:
- Nausea and digestive upset
- Diarrhea at very high doses
- Dizziness and fatigue
- Generally excellent safety profile
- No serious toxicity reported
Who benefits most
anxiety-depression-disorders
Natural support for mood disorders and anxiety
12-18g daily
pcos-fertility-issues
Proven benefits for PCOS and insulin resistance
2-4g daily (often combined with D-chiro-inositol)
ocd-compulsive-behaviors
Evidence-based support for OCD symptom reduction
12-18g daily
metabolic-syndrome-diabetes
Improves insulin sensitivity and glucose metabolism
2-6g daily
panic-disorder-sufferers
May reduce frequency and severity of panic attacks
12-18g dailyWhere to buy it
Look for Vitamin B8 (Inositol) at 2-18g (condition dependent) per serving. The form that matters here is Myo-Inositol.
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What else affects it
Beyond other supplements
!
Caffeine excess
High caffeine may counteract anti-anxiety effects
Opposing effects on anxiety and neurotransmittersHow it works
- Essential component of phosphatidylinositol signaling pathways
- Modulates serotonin receptor sensitivity and signaling
- Critical for insulin signal transduction
- Required for calcium mobilization in cells
- Essential for membrane structure and function
- Influences gene expression through signaling cascades
Key findings
what the evidence supports- Effective for PCOS and fertility issues (multiple clinical trials)
- Reduces anxiety and depression symptoms (meta-analyses)
- Beneficial for OCD symptom reduction (clinical studies)
- Improves insulin sensitivity in metabolic disorders
Sources: NIH Examine.com · data reviewed 2026-08-02
Compiled by Denis, who maintains this database and holds no medical qualification — every figure here is sourced or derived, never asserted. How we calculate it →
Common questions
What are the benefits of Vitamin B8 (Inositol)?
Documented effects: Mental health support; PCOS and fertility support; Obsessive-compulsive disorder relief; Metabolic syndrome improvement. Reduces anxiety, depression, and panic disorders
How much Vitamin B8 (Inositol) should you take per day?
The common daily range is 2-18g (condition dependent). By goal — pcos fertility: 2-4g daily; mental health: 12-18g daily; metabolic support: 2-6g daily; maintenance: 500mg-2g daily.
When is the best time to take Vitamin B8 (Inositol)?
Divided doses with meals. First effects are typically reported within 2-4 weeks for mood and anxiety improvements.
What are the side effects of Vitamin B8 (Inositol)?
At excessive doses: Very rare and mild:, Nausea and digestive upset, Diarrhea at very high doses, Dizziness and fatigue, Generally excellent safety profile. Safety rating at normal doses is 9 out of 10.
What should you not take with Vitamin B8 (Inositol)?
Separate it from Caffeine Excess, Glucose Excess by two to four hours. High caffeine may counteract anti-anxiety effects
Does Vitamin B8 (Inositol) interact with medications?
Documented interactions with lithium, ssri-antidepressants, diabetes-medications. Discuss these with a pharmacist before combining.
How do you know if you need Vitamin B8 (Inositol)?
The marker is Serum inositol or insulin sensitivity markers, optimal range Variable, higher levels generally beneficial. Common deficiency signs: Insulin resistance and glucose intolerance, Anxiety and depression, Hair loss and alopecia, Fatty liver development.