Calcium

Reviewed by the HeyPsych Medical Review Board

Board-certified psychiatrists and mental health professionals

Published August 17, 2025•Updated February 20, 2026•Reviewed February 20, 2026

Indications

Primary Indications

Osteoporosis prevention and treatmentDietary calcium deficiencyAdjunct in bone fracture healingPMS-related mood and somatic symptoms

Mechanism

Calcium is vital for bone mineralization and structural strength. It also functions as a secondary messenger in neurons, regulates neurotransmitter release, and is necessary for muscle contraction and cardiac rhythm stabilization. Calcium supplementation may help stabilize mood and reduce PMS symptoms by modulating neuronal excitability and hormonal signaling.

Dosing

Adult Dosing

note: Best absorbed in doses ≤500 mg, taken with meals; calcium citrate has better absorption than calcium carbonate in patients with low stomach acid.

typical: 1000–1200 mg daily (from diet and supplements combined)

Dosage Forms

Tablets
Chewables
Powder
Liquid

Onset Duration

Bone health effects require months to years of consistent intake. PMS symptom relief may occur within 2–3 cycles.

Adverse Effects

Common Side Effects

• Constipation

• Bloating

• Flatulence

⚠️ Serious Side Effects

Kidney stones
Hypercalcemia (in excessive intake)
Possible increased cardiovascular risk with very high doses

Warnings

Critical Safety Information

→Avoid exceeding 2000–2500 mg daily to reduce kidney stone and cardiovascular risks.
→Calcium should be balanced with magnesium and vitamin D for proper absorption and utilization.

Interactions

With: Thiazide diuretics

Risk: Hypercalcemia

Action: Monitor calcium levels

With: Bisphosphonates

Risk: Reduced absorption if taken together

Action: Separate dosing by several hours

With: Iron supplements

Risk: Reduced absorption of iron

Action: Take at different times

With: Levothyroxine

Risk: Reduced absorption

Action: Separate by at least 4 hours

Monitoring

Bone mineral density (if used for osteoporosis)
Serum calcium in high-dose users
Renal function in long-term use

Special Populations

👶Pregnancy

Safe and essential; reduces risk of preeclampsia when adequate

🤱Breastfeeding

Safe; increased requirements during breastfeeding

👧Children & Adolescents (Under 18)

Safe within age-appropriate dosing

👴Older Adults (65+)

Beneficial for bone preservation but monitor for cardiovascular risk

Tapering

Not required. Discontinuation may gradually increase risk of bone loss.

Clinical Notes

Vitamin D is required for optimal calcium absorption.
Excess calcium from supplements, but not diet, may be associated with increased cardiovascular risk.
May improve PMS-related mood swings and bloating in women with low dietary calcium.

This treatment information is for educational purposes only. Treatment decisions should be made in consultation with qualified healthcare professionals based on individual circumstances, symptoms, and medical history. Do not attempt treatment without professional guidance.

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