What do the states mean?+
- Solid: well studied, and it works.
- Half-there: the science is still forming.
- A ghost: almost no real studies.
- Hollow: well studied, and it does not work.
- A cord: the pair itself has been tested together.
- Air: nobody has ever tested this pair.
The full scoring method: How we score
Can you take vitamin B12 and folate together?
Take them together.
As of August 2026, vitamin B12 and folate have been tested together in 2 trials, in people with Alzheimer’s disease and children in India, followed up at age 6 to 7, and the pair came out ahead of placebo. Scored under the same rules as everything here.
18 studies · 2 tested the actual pair · 1 caution
What you’re seeing
- Vitamin B12 renders half-there: for energy and fatigue, the science is still forming.
- Folate renders solid: for pregnancy and birth defects, it is well studied and it works.
- The woven cord is the rare part: two trials gave both together, and the pair came out ahead of placebo.
You can tell before you read a word.
Magnesium + L-theanine are sold together in the same aisle. No trial has ever tested the pair. When that is true, we draw nothing between them. The nothing is the review.
The two pair trials
- 2021Randomized trial · 120 people · people with Alzheimer’s disease · the pair helpedsource
- 2023Randomized trial · 791 people · children in India, followed up at age 6 to 7 · the pair helpedsource
The other 16 studies on file tested each one alone. See all 18 studies
Fair questions
Is it safe to take vitamin B12 and folate together?+
The studies on this page gave both together and reported no harm from the combination. That is not the same as a safety trial, and it says nothing about your dose or your medication.
How many studies is this based on?+
2 that gave the pair together. The papers are listed above with links to the source.
Deeper
What each one is on its own+
Vitamin B12
- Energy and fatiguehalf-there
- Anaemia and iron levelshalf-there
- Hearthollow
- Memory and focushollow
- Moodhollow
- Nerve painhalf-there
- Pregnancyhalf-there
- Sleephalf-there
- Stress and anxietyhalf-there
Folate
- Pregnancy and birth defectssolid
- Heartsolid
- Moodsolid
- Nerve painsolid
Pairs that have been tested+
- Folate has been tested with creatine monohydrate, zinc, L-carnitine, vitamin D, CoQ10, inositol.
These are the combinations someone has actually run a study on. Every other pairing here is air.
Worth knowing+
- Vitamin B12: Searching 21 health outcomes returned no trial of vitamin B12 on its own for any of them. This is not the same as a supplement nobody has studied. Vitamin B12 is a nutrient your body needs, and there is research on it. What that research is about is correcting a measured deficiency, and multi-vitamin formulations where B12 is one ingredient among many. None of it tells you whether taking extra helps someone who already gets enough.