Vitamin D status in the elderly: seasonal substrate deficiency causes 1,25-dihydroxycholecalciferol deficiency

An Accurate and Rapid Method for the Determination of Proteins in Small Amounts of Blood Serum and Plasma

1946 • 1,618 citations

Intestinal Calcium Absorption and Serum Vitamin D Metabolites in Normal Subjects and Osteoporotic Patients

1979 • 865 citations

Influence of the Vitamin D-binding Protein on the Serum Concentration of 1,25-Dihydroxyvitamin D3

1981 • 507 citations

EFFECT OF AGE ON CALCIUM ABSORPTION

1970 • 450 citations

Calcium nutrition and bone health in the elderly

1982 • 421 citations

Deficient Production of 1,25-Dihydroxyvitamin D in Elderly Osteoporotic Patients

1981 • 373 citations

Impaired vitamin D metabolism with aging in women. Possible role in pathogenesis of senile osteoporosis.

1984 • 360 citations

Seasonal Changes in Human Plasma Levels of 25-Hydroxyvitamin D

1974 • 343 citations

Vitamin D. Basic Research and its Clinical Application

1979 • 318 citations

Diet, sunlight, and 25-hydroxy vitamin D in healthy children and adults.

1979 • 234 citations

Nutritional status in a healthy elderly population: vitamin D

1982 • 217 citations

The influence of age on the intestinal absorption of 47-Ca absorption in post-menopausal osteoporosis.

1965 • 193 citations

Relative contributions of diet and sunlight to vitamin D state in the elderly.

1979 • 171 citations

A radioimmunoassay for 1,25-dihydroxycholecalciferol.

1980 • 168 citations

Absence of Seasonal Variation in Serum Concentrations of 1,25-Dihydroxyvitamin D Despite a Rise in 25-Hydroxyvitamin D in Summer*

1981 • 158 citations

Plasma 25-hydroxy vitamin D concentrations in patients with fractures of the femoral neck.

1979 • 151 citations

VITAMIN-D STATUS IN LONG-STAY GERIATRIC PATIENTS

1975 • 128 citations

Calcium malabsorption in the elderly: the effect of treatment with oral 25‐hydroxyvitamin D₃

1983 • 117 citations

Measurement of 25-hydroxyvitamin D3 in serum.

1976 • 104 citations

SEASONAL VARIATION IN SERUM-25-HYDROXYVITAMIN-D IN THE ELDERLY IN BRITAIN

1977 • 100 citations

A Seasonal Variation Study of 25-Hydroxyvitamin D₃Serum Levels in Normal Humans

1979 • 93 citations

Assessment of 25-Hydroxyvitamin D lα-Hydroxylase Reserve in Postmenopausal Osteoporosis by Administration of Parathyroid Extract

1981 • 85 citations

RENAL IMPAIRMENT AND ITS EFFECTS ON CALCIUM METABOLISM IN ELDERLY WOMEN

1984 • 70 citations

RESPONSE OF PLASMA-25-HYDROXYVITAMIN D TO ULTRAVIOLET IRRADIATION IN LONG-STAY GERIATRIC PATIENTS

1978 • 63 citations

HOW COMMON IS OSTEOMALACIA IN THE ELDERLY?

1984 • 59 citations

Inadequate status and impaired metabolism of vitamin D in the elderly.

1981 • 55 citations

Acute Effects of Parathyroid Hormone on Vitamin D Metabolism in Patients with the Bone Loss of Aging*

1982 • 52 citations

Stimulation by Artificial Lighting of Calcium Absorption in Elderly Human Subjects

1971 • 52 citations

Vitamin D supplements and 25-hydroxy vitamin D concentrations in the elderly.

1977 • 48 citations

Ability of 25-Hydroxyvitamin D₃Therapy to Augment Serum 1,25- and 24,25-Dihydroxyvitamin D in Postmenopausal Osteoporosis*

1980 • 38 citations

Parathyroid Hormone Secretion in Primary Hyperparathyroidism

1977 • 29 citations

VITAMIN D HYDROXYLATION IN YOUTH AND OLD AGE

1978 • 26 citations