Vitamin B12
Essential vitamin for energy metabolism and nervous system function.
How it works
Mechanism of Action
B12 is required for mitochondrial energy production, DNA synthesis, and the formation of red blood cells that carry oxygen.
Evidence-based uses
What Vitamin B12 Is Used For
Methylcobalamin form is preferred. Especially important for vegetarians/vegans.
Clinical Evidence
Systematic review found B12 supplementation significantly reduced fatigue in deficient individuals, with improvements in energy and cognitive function within 2-4 weeks of treatment.
Safety
Interactions & Warnings
Metformin reduces vitamin B12 absorption over time. If you take metformin, regular B12 monitoring is recommended — supplementation may be necessary.
Long-term PPI use (omeprazole, pantoprazole) reduces stomach acid needed for B12 absorption. Consider sublingual or injection forms.
Compare prices
Buy Vitamin B12 in Australia
6 products compared across Australian retailers. Sorted by price per serve.
| Product | Price | /serve | |
|---|---|---|---|
Best NOW Foods Methyl B-12 1000 mcg, 100 Lozenges iHerb | $9.99 | $0.10 | Buy |
Blackmores Mega B Complex 200 Tablets Chemist Warehouse | $24.99 | $0.13 | Buy |
Blackmores Blackmores Mega B12 1000mcg Chemist Warehouse | $19.99 | $0.27 | Buy |
Herbs of Gold Activated B12 75 Tablets Mr Vitamins | $26.95 | $0.36 | Buy |
Thorne Thorne Methylcobalamin Thorne | $28.00 | $0.47 | Buy |
Thorne Methylcobalamin 60 Capsules Thorne | $29.99 | $0.50 | Buy |
Prices in AUD. Some links are affiliate links — we may earn a commission at no extra cost to you.
Should you take Vitamin B12?
Get a personalised supplement stack based on your health goals, age, medications, and preferences.
This information is for educational purposes only and is not intended as medical advice. Always consult a healthcare professional before starting any supplement. Evidence ratings are based on peer-reviewed clinical research. Individual results may vary.