B vitamins show up on every energy drink label. Here's what they really do for energy, and what they don't.
Written by Vita Globe Editorial Team | Reviewed against peer-reviewed research and NIH guidance | Updated October 7, 2026
Quick Answer
B vitamins help your cells release energy from carbohydrates, fats and protein, and B12 and folate are needed to make healthy red blood cells[1]. If you're low in them, correcting it can reduce fatigue. If your levels are already fine, extra B vitamins don't give you more energy, and they don't work like caffeine[1][2].
In this article
How do B vitamins help with energy?
B vitamins are coenzymes. They don't contain energy themselves, but the enzymes that break down food need them to work. Niacin becomes NAD, pantothenic acid becomes coenzyme A, and B6 and biotin help process protein, fats and carbs[1][3]. B12 and folate are needed to make red blood cells, which carry oxygen to your muscles and brain[4].
When do B vitamins help tiredness?
When you're actually low. Low B12 or folate can cause anemia, and anemia causes weakness and tiredness[4]. People at higher risk include older adults, vegans, people taking metformin or acid reducers, and people with digestive conditions. See Signs You May Be Low in B Vitamins.
Why don't B vitamins work like caffeine?
Caffeine is a stimulant that acts on your brain within minutes. B vitamins aren't stimulants. Once your body has enough, extra B vitamins are mostly excreted rather than turned into more energy[2]. The "energy" from an energy drink comes from caffeine and sugar, not the B vitamins.
What else causes low energy?
- Short or poor-quality sleep
- Low iron or vitamin D
- Thyroid problems
- Dehydration and skipped meals
- Stress, depression and some medications
If you're tired most days for weeks, see a doctor.
Our option
Vita Globe Vitamin B Complex Gummies
Six B vitamins in one caffeine-free gummy, to help cover the nutrients your body uses to release energy from food.
Frequently asked questions
How long does B complex take to work?
If you're deficient, it can take weeks for levels and symptoms to improve. If you're not, you likely won't notice a change.
Will B complex keep me awake?
Normal doses aren't stimulants, so they're unlikely to affect sleep.
Is B12 the most important B vitamin for energy?
B12 gets the most attention because deficiency is common in certain groups, but all the B vitamins play a part.
Sources
- Tardy AL, Pouteau E, Marquez D, Yilmaz C, Scholey A. Vitamins and Minerals for Energy, Fatigue and Cognition: A Narrative Review. Nutrients. 2020;12(1):228. doi:10.3390/nu12010228
- Kennedy DO. B Vitamins and the Brain: Mechanisms, Dose and Efficacy — A Review. Nutrients. 2016;8(2):68. doi:10.3390/nu8020068
- NIH ODS. Niacin Fact Sheet for Health Professionals. ods.od.nih.gov
- NIH ODS. Vitamin B12 Fact Sheet for Health Professionals. ods.od.nih.gov
About the Vita Globe Editorial Team
The Vita Globe Editorial Team researches and writes our wellness content from peer-reviewed research and guidance from bodies such as the NIH and FDA. We cite sources inline and update articles when the evidence changes.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for medical advice. Talk to your healthcare provider before starting any new supplement, particularly if you are pregnant, nursing, taking medication, or managing a health condition.
