Follicles that would have miniaturized maintain their productive capacity
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A separate meta-analysis that pooled results of trials in older adults with mild cognitive impairment found B-vitamin supplementation (6 to 24 months, depending on the trial) had no benefits on various cognitive parameters, including executive function, information processing speed, and episodic memory (90)
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Fortified breakfast cereals and multivitamins can serve as good sources for those who dont consume animal products
Important considerations include: Greying hair has multiple causes, predominantly genetic factors Most people with B12 deficiency do not experience changes in hair colour Other nutritional deficiencies (copper, iron, folate) may also affect hair health Reversibility of greying, even when nutritionally related, is uncommon and unpredictable If you are concerned about premature greying alongside other symptoms of B12 deficiency, it is advisable to consult your GP for appropriate assessment rather than assuming a nutritional cause
