GLOSSARY

Vitamin B6 Toxicity is harm from excessive intake, particularly sensory neuropathy with prolonged supplemental exposure; water solubility offers no complete protection.

Chronically excessive B6 can cause sensory neuropathy, tingling or balance problems despite water solubility. Upper limits differ between authorities and are not a universal personal rule. Add B6 from multivitamins, magnesium products and sports supplements. An active-form name does not automatically justify high intake or ignoring symptoms, and a product sold for recovery can still contribute substantial exposure.

Check supplement amount per serving, daily servings and units; a vitamin name alone does not specify exposure. Combining a multivitamin, single-vitamin product and fortified drink requires adding their contributions. Therapeutic doses for defined conditions cannot automatically become routine prevention for healthy athletes, and larger package numbers do not establish better outcomes.

Water solubility does not guarantee immediate harmless elimination of any excess. B12 can have substantial stores, while chronically high B6 intake is associated with nerve injury. Chemical grouping therefore cannot replace a safety assessment. Storage, saturable absorption and adverse effects need consideration for each member rather than treating the whole group as risk-free.

B6 includes pyridoxine, pyridoxal, pyridoxamine and their phosphorylated forms. PLP and PMP support amino-acid reactions and other pathways; PLP also participates in glycogen utilisation. These structures do not create separate dietary requirements. Active-form marketing without evidence and dose comparison does not establish universally superior absorption, safety or exercise performance.

High intake, increased stores and toxicity are not identical. Risk depends on vitamin, chemical form, amount, duration and underlying conditions. Overlapping supplements, fortified drinks and pre-workout products can supply the same substance repeatedly. Add contributions from all sources rather than evaluating each package's dose separately or assuming that more products improve coverage.

Correcting a confirmed deficiency can restore normal function, but improvement in deficient people does not establish benefit for adequately supplied athletes. Sleep, energy intake, training and illness also need consideration. These descriptions explain forms and sources; treatment choices, especially with medication or underlying disease, remain dependent on individual assessment rather than extrapolation from a general example.