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Researchers sometimes explore differences in metabolism and pharmacokinetics between genders

This usually occurs in individuals with underlying digestive conditions, those who have trouble absorbing all nutrients through digestion, or those with pernicious anemia, which specifically prevents B12 absorption

The USP method requires adding saturated potassium chloride before measurement because bacteriostatic water has essentially no ionic strength, and a glass electrode cannot hold a stable reading without it

Working with a qualified healthcare provider helps ensure that the right compounds, dosages, and protocols are selected