Vitamins

49 Vitamins compounds, 28 at evidence level A, average absorption 82%. Forms differ mostly in how much of the dose actually reaches you, not in what they do.

49 compounds

250 interactions

28 evidence A

Most used forms

Ranked by popularity, with what each one actually does

Vitamin D3

Bone health & immune support

1000-2000 IU Morning with fat Evidence A Very high absorption

Vitamin C (Ascorbic Acid)

Immune support & antioxidant

500-1000 mg Divided doses with meals Evidence A Very high absorption

Vitamin B12 (Methylcobalamin)

Energy & nerve support

500-1000 mcg Morning sublingual Evidence A Very high absorption

Vitamin B12 (Cyanocobalamin)

Energy & nerve support

250-1000 mcg Morning with food Evidence A High absorption

Vitamin C (Sodium Ascorbate)

Gentle immune support & antioxidant

500-2000 mg Divided doses with meals Evidence A Very high absorption

What people take these for

7 goals

Energy & Metabolism 12 Brain & Focus 9 Immunity 6 Liver & Detox 6 Heart 6 Joints & Bones 5 Skin & Hair 3

Most searched here

what people in this group actually look up

Vitamin B12 (Cyanocobalamin) Energy & nerve support 250-1000 mcg A 70% Vitamin D3 Bone health & immune support 1000-2000 IU A 85% Vitamin B9 (Folic Acid) DNA synthesis & pregnancy support 400-800 mcg A 85% Vitamin B7 (Biotin) Hair, skin & nail health 300-5000 mcg A 80% Vitamin B3 (Niacinamide) Energy & skin health (no flush) 100-1000 mg A 88% Vitamin B8 (Inositol) Mental health & PCOS support 2-18g (condition dependent) B 95%

Which form to buy

the question people actually search

Best form of Vitamin D 3 forms Vitamin D3 (Calcidiol) · 95% Best form of Vitamin C 8 forms Vitamin C (Liposomal) · 95% Best form of Vitamin K 4 forms Vitamin K2 (MK-9) · 85% Best form of Vitamin E 4 forms Vitamin E (Gamma-Tocopherol) · 85% Best form of Vitamin B12 4 forms Vitamin B12 (Methylcobalamin) · 85% Best form of Folate 3 forms Vitamin B9 (Folinic Acid) · 98%

Choosing between forms

Same compound, different absorption

Vitamin B12 (Cyanocobalamin) vs Vitamin B12 (Methylcobalamin) 70% · 85% Vitamin B12 (Hydroxocobalamin) vs Vitamin B12 (Methylcobalamin) 75% · 85% Vitamin B12 (Adenosylcobalamin) vs Vitamin B12 (Methylcobalamin) 80% · 85% Vitamin B12 (Cyanocobalamin) vs Vitamin B12 (Hydroxocobalamin) 70% · 75% Vitamin B12 (Adenosylcobalamin) vs Vitamin B12 (Cyanocobalamin) 80% · 70% Vitamin B12 (Adenosylcobalamin) vs Vitamin B12 (Hydroxocobalamin) 80% · 75% Vitamin C (Ascorbic Acid) vs Vitamin C (Sodium Ascorbate) 80% · 85% Vitamin C (Ascorbic Acid) vs Vitamin C (Liposomal) 80% · 95%

All 49 compounds

dose · evidence · documented interactions

Vitamin D3 Bone health & immune support 1000-2000 IU A 5 Vitamin C (Ascorbic Acid) Immune support & antioxidant 500-1000 mg A 5 Vitamin B12 (Methylcobalamin) Energy & nerve support 500-1000 mcg A 5 Vitamin B12 (Cyanocobalamin) Energy & nerve support 250-1000 mcg A 6 Vitamin C (Sodium Ascorbate) Gentle immune support & antioxidant 500-2000 mg A 5 Folate (5-MTHF) DNA synthesis & fetal development 400-800 mcg A 5 Choline (Bitartrate) Basic affordable choline 500-2000 mg A 5 Vitamin B9 (Folic Acid) DNA synthesis & pregnancy support 400-800 mcg A 6 Vitamin B7 (Biotin) Hair, skin & nail health 300-5000 mcg A 6 Vitamin B6 (Pyridoxine HCl) Neurotransmitter & hormone support 25-100 mg A 5 Vitamin A (Retinyl Palmitate) Direct vitamin A for immune & vision 2500-8000 IU A 5 Vitamin B6 (P5P) Neurotransmitter & hormone support 25-100 mg A 5 Vitamin C (Liposomal) Maximum absorption vitamin C 1000-3000 mg B 5 Vitamin A (Retinol) Vision & immune support 2500-5000 IU A 5 Vitamin B12 (Hydroxocobalamin) Long-acting natural B12 500-1500 mcg A 5 Vitamin B3 (Niacinamide) Energy & skin health (no flush) 100-1000 mg A 5 Vitamin C (Calcium Ascorbate) Gentle vitamin C + calcium 500-2000 mg A 5 Vitamin K2 (MK-7) Bone & cardiovascular health 100-200 mcg B 5 Vitamin C (Ester-C) Extended-release gentle vitamin C 500-2000 mg B 5 Vitamin A (Beta-Carotene) Safe vitamin A & antioxidant 15,000-25,000 IU A 6 Vitamin E (Alpha-Tocopherol) Antioxidant protection 100-400 IU A 5 Vitamin C (Magnesium Ascorbate) Gentle vitamin C + muscle support 500-2000 mg A 5 Vitamin B3 (Niacin) Cholesterol & energy support 50-500 mg A 5 Vitamin E (Mixed Tocopherols) Complete antioxidant protection 200-400 IU A 5 Vitamin B1 (Thiamine) Energy metabolism & brain function 25-100 mg A 6 Vitamin D2 (Ergocalciferol) Vegan bone & immune support 2000-4000 IU A 5 Vitamin K2 (MK-4) Fast-acting bone health 15-45 mg (divided doses) B 5 Vitamin B5 (Pantothenic Acid) Energy metabolism & stress support 100-500 mg A 5 Vitamin C (Rose Hips) Natural whole food vitamin C complex 500-2000 mg extract B 5 Vitamin B2 (Riboflavin) Energy production & migraine prevention 25-100 mg A 6 Choline (CDP-Choline) Clinical brain health & recovery 250-1000 mg B 5 Vitamin B8 (Inositol) Mental health & PCOS support 2-18g (condition dependent) B 5 Vitamin B3 (Nicotinamide Riboside) Advanced NAD+ & anti-aging 250-500 mg B 5 Vitamin K1 (Phylloquinone) Blood clotting support 90-120 mcg A 5 Vitamin E (Gamma-Tocopherol) Anti-inflammatory & heart protection 100-400 mg B 5 Vitamin B1 (Benfotiamine) Enhanced nerve & brain support 100-300 mg B 5 Vitamin B8 (D-Chiro-Inositol) Advanced insulin sensitivity & PCOS 300-1000 mg B 5 Vitamin B3 (NMN) Maximum NAD+ & longevity 250-500 mg B 5 Vitamin B9 (Folinic Acid) Medical-grade folate bypassing genetics 400-1000 mcg B 5 Vitamin B2 (Riboflavin-5-Phosphate) Active energy production & antioxidant 10-50 mg A 5 Vitamin C (Ascorbyl Phosphate) Ultra-stable extended-release vitamin C 500-2000 mg B 5 Vitamin B6 (Pyridoxal) Basic amino acid & protein metabolism 2-25 mg A 5 Vitamin B5 (Pantethine) Cholesterol & advanced energy support 300-900 mg B 5 Vitamin B6 (Pyridoxamine) Anti-glycation & advanced glucose support 25-200 mg B 5 Vitamin E (Tocotrienols) Superior brain & heart protection 50-200 mg B 5 Vitamin B12 (Adenosylcobalamin) Mitochondrial energy & metabolism 1000-3000 mcg B 5 Vitamin D3 (Calcidiol) Fast-acting vitamin D therapy 5-20 mcg (medical supervision) B 5 Vitamin K2 (MK-9) Extended-release bone & heart support 50-200 mcg (experimental) C 5 Vitamin K3 (Menadione) Research-grade vitamin K (not for consumption) Not recommended for human use C 4

Common questions

Which vitamins form is best absorbed?

Vitamin B8 (D-Chiro-Inositol) leads at 98% bioavailability. Absorption is the number that decides how much of the dose reaches you, so it matters more than the milligrams on the label.

What is the difference between vitamins forms?

They deliver the same active compound but differ in absorption, tolerance and cost per month. The cheaper forms are usually the ones absorbed least.