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Description
The honest clinical answer is that they are not competing

When to seek medical attention : Contact your GP if you experience persistent fatigue alongside neurological symptoms, particularly if you have risk factors such as being vegan, having gastrointestinal disease, or taking medications affecting B12 absorption

The enzyme activity was assayed using the prepared membrane fractions (0.3 mg total protein determined by Bradford assay for each reaction) in the presence of 0.5 mM NADPH and 0.5 mM testosterone in 0.1 M sodium citrate pH 5.0 buffer

Source : J

The three combine to make up the entire 25% in the product, though the majority of that is quite clearly THDA
