The most commonly used method of analysis for assessing vitamins A,K,and B₆ is:

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High performance liquid chromatography (HPLC) is the most commonly used method to analyze vitamins A, K, and B. It provides high sensitivity, specificity, and accuracy in quantifying these vitamins in various biological samples. Spectrophotometry can also be used, but it has lower sensitivity and specificity compared to HPLC. Immunoassay and competitive protein binding are less commonly used methods for these vitamins.

The Most Commonly Used Method of Analysis for Assessing Vitamins