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The retinol dehydrogenases that have been shown to be involved in retinaldehyde and retinol interconversions are members of the short-chain dehydrogenase/reductase (SDR) superfamily of enzymes
it is harder to state precisely what the peer-reviewed human evidence does and does not establish
Neuroscience
Even individuals with a healthy diet can experience B12 depletion due to factors like stress, intense physical activity, dehydration, or lifestyle habitsmaking regular replenishment through injections or IV therapy a useful wellness strategy
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