GLOSSARY

Vitamin Storage in the Body Table

Storage differs within both solubility classes; daily planning still matters even when body stores exist.

Vitamin Storage means retention of vitamins or related forms in tissues, with markedly different pool sizes and durations.

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.

Animal foods and genuinely fortified products are dependable B12 sources. Fermented plant foods or algae should not be assumed reliable without verified content and forms. Vegan diets need a planned fortified-food or supplement source. Body stores can delay deficiency, so having no symptoms in the first months does not guarantee long-term adequacy or make regular provision unnecessary.

Whole or enriched grains, pulses, some seeds and meats supply thiamine, with refining and cooking affecting content. Relatively limited stores make regular provision important. Prolonged restriction, certain illnesses and heavy alcohol use alter risk. Weakness or tingling is not specific to B1; significant symptoms require assessment of causes rather than an assumption based on diet alone.

B12 stores can delay deficiency but do not justify abandoning a regular source, particularly in vegan diets.

After E forms are absorbed, hepatic transfer proteins preferentially return alpha-tocopherol to circulation, while other forms are metabolised differently. A high dietary amount of another member therefore need not produce blood concentrations comparable to alpha. This regulation cannot be predicted simply from antioxidant wording or an oil being described as natural.

Intake, absorption and body status describe different stages. An apparently adequate recorded intake may coexist with malabsorption, illness or drug interactions. Conversely, one low-intake day does not establish clinical deficiency. Several days of intake, relevant history and an appropriate marker provide more information than one meal or nonspecific tiredness alone.

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.

Table references: NIH ODS · 1