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Independently tested by Testides Lab by HPLC/MS to a 98% purity specification (~99% typical), with the certificate of analysis published to the COA library on release

The study found that, among men with infertility, low vitamin B12 was linked to a higher risk of testosterone deficiency and impaired androgenic hormonal profiles that impact sperm production, and hence fertility

Clearer cognitive function High-dose vitamin B12 supplementation can lower high homocysteine levels in older adults both with and without cognitive impairment

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Common indicators include: Fatigue and Weakness: Persistent tiredness and low energy are often the first signs of low vitamin D