Vitamin D

• Helps absorb calcium and supports bone strength
• Important for muscle function and balance (fall prevention)
• Supports immune and overall health

Calcium

• Builds and maintains bones/teeth
• Needed for muscle contraction and normal heart rhythm
• Too little → bone loss; too much from pills → kidney stone risk in some

Calcium-rich foods (approximate mg/serving)

• Dairy: yogurt (250–300), milk (300), cheese (200–300)
• Fortified plant milks/juices (200–350)
• Tofu set with calcium (200–400), canned salmon/sardines with bones (200–325)
• Dark greens (collards, kale, bok choy) (100–250)
• Sesame/tahini, almonds (small amounts add up)

Vitamin D foods

• Fatty fish: salmon, mackerel, sardines
• Egg yolks
• Fortified milk/plant milks, some cereals and yogurts

• Brief morning or late-afternoon sun on arms/legs can contribute to vitamin D
• Use sun protection to prevent skin damage; darker skin or limited sun often requires dietary D or supplements
• In winter or with minimal sun, most older adults need supplemental vitamin D

Vitamin D (D3)

• Common daily doses: 800–2,000 IU; personalize to blood level and season
• Take with or without food; consistency matters
• Recheck 25-OH D about 8–12 weeks after a dose change

Calcium

• Calculate diet first; supplement only the gap to your target
• Calcium carbonate: take with meals; calcium citrate: with or without food (better if on acid-reducing meds)
• Split doses ≤600 mg elemental calcium at a time

• Calcium can reduce absorption of thyroid pills (levothyroxine), some antibiotics, and osteoporosis meds—separate by several hours
• High-dose vitamin D may affect diuretics or conditions causing high calcium—use supervised plans
• Antacids or acid-reducing meds may lower calcium carbonate absorption—consider calcium citrate

Signs of low levels

• Vitamin D: bone pain, muscle weakness, frequent falls, low mood (non-specific)
• Calcium (low blood calcium): cramps, tingling, in severe cases spasms—needs urgent medical evaluation

Too much (rare but important)

• High vitamin D → high blood calcium: thirst, frequent urination, nausea, confusion
• Excess calcium pills → constipation, kidney stone risk in some

• Vitamin D status: 25-hydroxyvitamin D blood test
• Recheck 8–12 weeks after starting or changing dose
• Check kidney function and calcium if taking higher doses or with CKD/stones

Food or pills for calcium?

Food first. Add only enough supplement to reach your daily target, split into smaller doses.

Best time to take vitamin D?

Any time you’ll remember. Daily or weekly plans can work—stay consistent and recheck levels.

Can I take calcium with my thyroid pill?

Separate by several hours—calcium blocks absorption of levothyroxine.

Does more vitamin D mean stronger bones?

More isn’t always better. Target an appropriate blood level and combine with adequate calcium, protein, and movement.