Vitamin B12 is a water-soluble vitamin and can be difficult for the body to absorb efficiently. The absorption rate is about 50% for the first 2 mcg, but it decreases significantly with higher doses:
- At 500 mcg, approximately 10 mcg is absorbed (2%).
- At 1000 mcg, approximately 13 mcg is absorbed (1.3%).
The NHS in the UK advises that taking up to 2000 mcg of B12 supplements daily is unlikely to cause harm.
The B12 content for each supplement is as follows:
- B12 Dual Power: 1000 mcg
- Iron Energy+: 3 mcg
When combined, your total B12 intake would be 1003 mcg per day, which is well within the NHS-recommended limit. This combined dosage would result in an absorption of approximately 13-14 mcg of B12, which is sufficient to address potential deficiencies.
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