September is here, and with it come packed schedules, earlier alarms, and a mid-afternoon slump that seems to arrive right on cue. If your energy has been dipping lately, one nutrient keeps coming up in health conversations: vitamin B12. Here is what this essential vitamin actually does, who may benefit from getting more of it, and how to pick a supplement that fits your routine.
What Vitamin B12 Does
Vitamin B12, also known as cobalamin, is a water-soluble vitamin that the body cannot make on its own. According to the National Institutes of Health (NIH), it plays a key role in three fundamental jobs: forming red blood cells, supporting neurological function, and helping build DNA. It belongs to the B-vitamin family, the group of nutrients that helps convert the food you eat into usable energy — which is why B12 and its cousins are so often associated with feeling energized.
Unlike vitamin C, B12 is stored in the liver, and the body can hold onto reserves for years. Adults need about 2.4 micrograms per day according to the NIH — a small amount, but one that depends on a healthy digestive process to be absorbed properly.
Who May Need More B12
B12 is found naturally in animal-based foods such as fish, meat, poultry, eggs, and dairy, so most people who eat a varied diet get some every day. That said, two groups come up again and again in guidance from organizations like the NIH and the Harvard T.H. Chan School of Public Health:
- Older adults. Stomach acid production tends to decline with age, and the NIH estimates that a meaningful share of adults over 50 absorb B12 from food less efficiently.
- People following plant-based diets. Unfortified plant foods do not provide reliable amounts of B12, so vegans and vegetarians are often advised to include fortified foods or a supplement.
If you suspect your levels are low, the simplest first step is a conversation with your doctor and a basic blood test. Browsing a curated vitamins and supplements collection can then help you find a format that suits your needs.
How to Choose a B12 or B-Complex Supplement
Walk down any supplement aisle and you will meet two common forms: cyanocobalamin and methylcobalamin. Both are widely used and well absorbed at typical supplement doses, so consistency matters more than the form on the label. You will also choose between a standalone B12 product and a B-complex formula. A complex pairs B12 with B1, B2, B3, B5, B6, folate, and biotin — nutrients that work alongside one another in energy metabolism. Because B vitamins are water-soluble and excess amounts are passed in urine, taking far more than the label recommends is rarely useful. As with any supplement, stick with established brands that clearly list their ingredients and doses.
How to Use It
Timing is flexible, but many people take their B vitamin in the morning alongside breakfast, which makes it easy to remember. Effervescent tablets that dissolve in water, chewables, and capsules all work equally well, so choose whichever format you will actually keep up with. Daily consistency matters far more than the time of day.
Our Energy-Support Picks
Ready to add B12 to your routine? These four options are currently available in our store:
GNC Vitamin B-12 1000mcg 100 Tablets
$60.99 · View product →
Swisse Ultiboost Vitamin B+ 60 Tablets
$72.99 · View product →
GNC Vitamin B-Complex 100 90 Capsules
$91.99 · View product →
Redoxon Vitamin C + B Complex Energy Effervescent Orange 30 Tablets
$41.99 · View product →
All of these and more can be found in our Vitamins & Supplements collection.
The Takeaway
Vitamin B12 does quiet but essential work behind the scenes: it helps build red blood cells, supports the nervous system, and teams up with other B vitamins to unlock the energy in your food. Whether you get yours from a balanced plate, fortified foods, or a daily supplement, the goal is the same — keep this small but mighty nutrient on your side as the busy season ramps up.
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.