NEW
💉 Cyanocobalamin
NOW Supplements, Folic Acid 800 mcg + B-12 (Cyanocobalamin)…
Cost per serving
$0.02
250 servings · ~250-day supply
$6.11Price from Amazon.com
NOW · Amazon.com 0
See the offer Best Vitamin B12 (Cobalamin) for energy and fatigue
B12 is taken for energy because a deficiency causes fatigue — the risk is higher on a plant-based diet or with metformin. Below, the vitamin b12 (cobalamin) products people use ranked by real cost per dose (to the commonly-studied 500 mcg dose). A value comparison, not medical advice.
Updated September 2026
What the evidence actually shows
B12 relieves fatigue that is caused by B12 deficiency. If your level is normal, extra B12 will not give you an energy boost. It has no upper limit, so correcting a shortfall is low-risk.
Commonly used: enough to correct a low level (often 500–1,000 mcg/day oral).
How this list is built: these are vitamin b12 (cobalamin) products ranked by real cost per dose across our whole vitamin b12 (cobalamin) catalogue — not filtered or re-ordered by energy and fatigue. We don’t hold per-product evidence for a specific use, so we don’t pretend to rank for one. Products whose own label says they are for something else are left out.
Background on vitamin b12 (cobalamin) from the NIH Office of Dietary Supplements .
Ranked by cost per dose
NEW
⚡ Vitamin B12 (Cobalamin)
VITBOOST Vitamin B12 1000 mcg Chewable Tablets - 365 Count…
Cost per serving
$0.02
365 servings · ~365-day supply
$8.95Price from Amazon.com
VITBOOST · Amazon.com 0
See the offer NEW
⚡ Vitamin B12 (Cobalamin)
Vitamatic Vitamin B12 1000 mcg Fast Dissolve
Cost per serving
$0.03
365 servings · ~365-day supply
$9.99Price from Amazon.com
Vitamatic · Amazon.com 0
See the offer NEW
⚡ Vitamin B12 (Cobalamin)
Carlyle Vitamin B-12 500mcg | 300 Tablets | Vegetarian
Cost per serving
$0.03
300 servings · ~300-day supply
$9.99Price from Amazon.com
Carlyle · Amazon.com 0
See the offer NEW
🅱️ B-Complex
Carlyle B-Complex Vitamin with B12 | 300 Tablets | High…
Cost per serving
$0.03
300 servings · ~300-day supply
$9.99Price from Amazon.com
Carlyle · Amazon.com 0
See the offer NEW
💉 Cyanocobalamin
Piping Rock Vitamin B12 | 500 mcg | 250 Tablets | Supplement…
Cost per serving
$0.03
250 servings · ~250-day supply
$8.49Price from Amazon.com
Piping Rock · Amazon.com 0
See the offer NEW
💉 Methylcobalamin 3rd-party
BulkSupplements.com Vitamin B12 Methylcobalamin Capsules - B12…
Cost per serving
$0.04
500 servings · ~500-day supply
$19.96Price from Amazon.com
BulkSupplements.com · Amazon.com 0
See the offer NEW
⚡ Vitamin B12 (Cobalamin)
NOW B-12 1000mcg 250 Lozenges
Cost per serving
$0.04
250 servings · ~250-day supply
$9.99last seen · confirm on Amazon.com
NOW Foods · Amazon.com 0
See the offer NEW
⚡ Vitamin B12 (Cobalamin)
Bronson Vitamin B12 1000mcg Once Daily Formula Non-GMO
Cost per serving
$0.04
250 servings · ~250-day supply
$9.99Price from Amazon.com
Bronson · Amazon.com 0
See the offer See the full ranking, benchmarks and lab-tested brands on best vitamin b12 (cobalamin) by cost per dose.
Frequently asked
Does vitamin b12 (cobalamin) help with energy and fatigue?+
B12 relieves fatigue that is caused by B12 deficiency. If your level is normal, extra B12 will not give you an energy boost. It has no upper limit, so correcting a shortfall is low-risk. This page ranks the products people take by real cost per dose; it does not claim a supplement treats or cures anything. Not medical advice — talk to a clinician about energy and fatigue.
Which vitamin b12 (cobalamin) is cheapest for energy and fatigue?+
As of September 2026, the best value we track is NOW Supplements, Folic Acid 800 mcg + B-12 (Cyanocobalamin) 25 mcg, B Complex Vitamin, 250 Tablets. The full ranking by cost per dose is above; Price ÷ servings ÷ dose — the number retailers rarely divide out.
How much vitamin b12 (cobalamin) for energy and fatigue?+
Commonly enough to correct a low level (often 500–1,000 mcg/day oral). This is a general reference, not a prescription — confirm the right amount for you with a clinician. Not medical advice.