OSTERRA 1500 MG/ 800 IU TAB

Benefits & Uses

Primary Benefit

Supports bone health, density, and calcium absorption.

Health Claims

Contributes to normal bone and teeth maintenance; supports calcium absorption and utilization; helps prevent osteoporosis and osteomalacia; supports normal muscle function and immune system function

Common Deficiency Symptoms

Calcium deficiency: muscle cramps, numbness, brittle nails, osteoporosis; Vitamin D deficiency: fatigue, bone pain, muscle weakness, frequent infections, rickets in children, osteomalacia in adults

Target Population

Adults over 50, postmenopausal women, individuals with osteoporosis or osteopenia, people with limited sun exposure, patients on long-term corticosteroids, individuals with low dietary calcium intake

Scientific Evidence Level

Strong

Onset Timeline

Vitamin D blood levels (25-OH-D) improve within 2-4 weeks of consistent use; measurable improvements in bone mineral density typically observed after 6-12 months of continuous use

Usage & Dosage

Suggested Use

Take 1 tablet daily with a meal.

Serving Size

1 film-coated tablet

Servings Per Container

30

Best Time to Take

With meals

Recommended Daily Intake

Calcium: Adults 1000-1200 mg/day elemental calcium; Vitamin D3: Adults 600-800 IU/day, adults over 70: 800 IU/day

Upper Tolerable Limit

Calcium: 2500 mg/day elemental calcium for adults 19-50; 2000 mg/day for adults over 50; Vitamin D3: 4000 IU/day for adults

Absorption Enhancers

Take with a fat-containing meal to enhance Vitamin D3 absorption; adequate stomach acid improves calcium carbonate dissolution; magnesium supports Vitamin D activation

Absorption Inhibitors

High-fiber foods, phytates (whole grains, legumes), oxalates (spinach, rhubarb), and phosphates reduce calcium absorption; proton pump inhibitors reduce calcium carbonate absorption by lowering gastric acid; caffeine and alcohol reduce calcium retention

Side Effects

Possible Side Effects

Constipation, bloating, and flatulence are common with calcium carbonate; high doses may cause hypercalcemia (nausea, vomiting, weakness, polyuria, kidney stones); Vitamin D toxicity at excessive doses causes hypercalcemia and soft tissue calcification

Toxicity Risk

Low

Upper Tolerable Limit

Calcium: 2500 mg/day elemental calcium for adults 19-50; 2000 mg/day for adults over 50; Vitamin D3: 4000 IU/day for adults

Safety & Warnings

Contraindications

Hypercalcemia and/or hypercalciuria; vitamin D toxicity (hypervitaminosis D); nephrolithiasis (calcium stones) or severe renal impairment; conditions predisposing to hypercalcemia such as hyperparathyroidism and sarcoidosis (use is contraindicated/should be avoided unless specialist-directed)

Pregnancy Safety

Consult Doctor

Breastfeeding Safety

Safe (at recommended doses); consult doctor if high-dose/prolonged use or maternal hypercalcemia/renal disease

Children Suitability

Not specifically indicated for children; consult a physician before use in patients under 18

Interactions

Medication Interactions

Calcium carbonate reduces absorption of bisphosphonates, fluoroquinolone antibiotics, tetracyclines, levothyroxine, and iron supplements - take these medications at least 2 hours apart; thiazide diuretics increase risk of hypercalcemia; corticosteroids reduce calcium absorption; Vitamin D3 enhances digoxin toxicity risk

Supplement Interactions

Calcium competes with iron, zinc, and magnesium for absorption - take separately; high-dose calcium may reduce magnesium absorption

Synergistic Nutrients

Vitamin D enhances calcium absorption. Magnesium and Vitamin K2 also work with calcium and Vitamin D to support bone health.

Special Populations

Target Population

Adults over 50, postmenopausal women, individuals with osteoporosis or osteopenia, people with limited sun exposure, patients on long-term corticosteroids, individuals with low dietary calcium intake

Children Suitability

Not specifically indicated for children; consult a physician before use in patients under 18

Pregnancy Safety

Consult Doctor

Breastfeeding Safety

Safe (at recommended doses); consult doctor if high-dose/prolonged use or maternal hypercalcemia/renal disease

Storage & Patient Advice

SFDA Storage Conditions

store below 30°c

Storage Conditions

Store below 30°C (in the original blister pack).

Patient Counseling

Take 1 tablet orally once daily with a meal (preferably with food) to improve calcium carbonate absorption and reduce GI upset. Separate from interacting medicines: take at least 4 hours apart from levothyroxine; at least 2 hours apart from bisphosphonates; and separate from iron, zinc/magnesium supplements, and tetracycline/fluoroquinolone antibiotics (typically 2-6 hours depending on the antibiotic) to avoid reduced absorption. Do not exceed the labeled dose unless advised by a clinician. Maintain adequate hydration; seek medical advice if symptoms of hypercalcemia occur (e.g., nausea/vomiting, constipation, polyuria, thirst, confusion) or if you have a history of kidney stones, hyperparathyroidism, or significant renal impairment. Periodic calcium and 25(OH)D monitoring is reasonable in long-term use or high-risk patients.

Science & Evidence

Bioavailability Form

Calcium Carbonate - contains 40% elemental calcium and requires stomach acid for optimal absorption. Cholecalciferol (Vitamin D3) - the most biologically active form of vitamin D, more effective at raising blood levels than Vitamin D2.

Water or Fat Soluble

Calcium: Water-soluble; Vitamin D3: Fat-soluble

Scientific Evidence Level

Strong

Onset Timeline

Vitamin D blood levels (25-OH-D) improve within 2-4 weeks of consistent use; measurable improvements in bone mineral density typically observed after 6-12 months of continuous use

Food Sources

Calcium: dairy products (milk, cheese, yogurt), sardines, almonds, fortified plant milks, broccoli; Vitamin D3: fatty fish (salmon, mackerel, tuna), egg yolks, fortified milk, cod liver oil, UV-exposed mushrooms

Product Information

Supplement Type

Combination

Certification

SFDA registered (Registration No. 2306222254); manufactured by SPIMACO under GMP standards

Suitable for Vegetarians

Yes

Suitable for Vegans

No

Vitamin D Form

D3

Calcium Included

Yes - Calcium Carbonate 1500 mg (providing approximately 600 mg elemental calcium)

Vitamin K Included

No