Calcitonin: The Body's Calcium Traffic Controller
Calcitonin is a hormone your thyroid gland produces to keep calcium levels in your blood balanced—think of it as a traffic cop managing how much calcium stays in your bloodstream versus how much gets stored or removed. People use it medically to treat osteoporosis and other bone conditions where calcium balance goes haywire, and doctors have relied on it safely for decades.
Here's how it actually works: Your bones are constantly being broken down and rebuilt by specialized cells. When calcium gets too high in your blood, calcitonin acts like a brake pedal. It tells the bone-eating cells—called osteoclasts—to slow down and stop chewing through your bone tissue. At the same time, your kidneys get the signal to dump excess calcium into your urine, getting it out of your system faster. It's a one-two punch that brings your calcium levels back down.
Interestingly, the version doctors use comes from salmon, which is about fifty times stronger at this job than human calcitonin naturally is. Beyond managing calcium, calcitonin also has a hidden benefit: it eases bone pain directly by triggering pain-relief systems in your brain, completely separate from its work on your skeleton. That's why it's helpful even when people aren't dealing with calcium emergencies.
Dosage Information
Typical Dose
100-200 IU daily (osteoporosis), 4 IU/kg every 12 hours (hypercalcemia)
Frequency
Daily or every other day depending on indication
Administration
Subcutaneous or intramuscular injection, or intranasal spray (Miacalcin)
Half-Life
12–16 minutes
Notes
Intranasal formulation is most commonly used for osteoporosis — 200 IU daily alternating nostrils. Injectable forms used for acute hypercalcemia. Resistance can develop with long-term use due to receptor downregulation.
Why this matters
Short half-life; salmon calcitonin nasal spray provides sustained bone effects.
Protocol cycle
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Where does Calcitonin sit?
See how this peptide compares across all 150 peptides in our database.
Evidence Score
0.70
Compound Data
Molecular Formula
C151H226N40O45S3
Molecular Weight
3417.90 g/mol
IUPAC Name
(3S)-4-[[(2S)-1-[[(2S)-4-amino-1-[[(2S)-6-amino-1-[[(2S)-1-[[(2S)-1-[[(2S,3R)-1-[[(2S)-1-[(2S)-2-[[(2S)-5-amino-1-[[(2S,3R)-1-[[(2S)-1-[[(2S,3S)-1-[[2-[[(2S)-1-[[2-[[(2S)-1-[(2S)-2-carbamoylpyrrolidin-1-yl]-1-oxopropan-2-yl]amino]-2-oxoethyl]amino]-3-methyl-1-oxobutan-2-yl]amino]-2-oxoethyl]amino]-3-methyl-1-oxopentan-2-yl]amino]-1-oxopropan-2-yl]amino]-3-hydroxy-1-oxobutan-2-yl]amino]-1,5-dioxopentan-2-yl]carbamoyl]pyrrolidin-1-yl]-1-oxo-3-phenylpropan-2-yl]amino]-3-hydroxy-1-oxobutan-2-yl]amino]-3-(1H-imidazol-4-yl)-1-oxopropan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-1-oxohexan-2-yl]amino]-1,4-dioxobutan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-3-[[(2S)-5-amino-2-[[(2S,3R)-2-[[(2S)-2-[[(2S,3R)-2-[[2-[[(2S)-2-[[(2S)-2-[[(4R,10S,13S,16S,22R)-22-amino-16-(2-amino-2-oxoethyl)-7-[(1R)-1-hydroxyethyl]-10-(hydroxymethyl)-13-(2-methylpropyl)-6,9,12,15,18,21-hexaoxo-1,2-dithia-5,8,11,14,17,20-hexazacyclotricosane-4-carbonyl]amino]-4-methylsulfanylbutanoyl]amino]-4-methylpentanoyl]amino]acetyl]amino]-3-hydroxybutanoyl]amino]-3-(4-hydroxyphenyl)propanoyl]amino]-3-hydroxybutanoyl]amino]-5-oxopentanoyl]amino]-4-oxobutanoic acid
PubChem CID
118984394Potential Side Effects
Calcitonin discussions
Quick Facts
- Administration
- Subcutaneous or intramuscular injection, or intranasal spray (Miacalcin)
- Typical Dose
- 100-200 IU daily (osteoporosis), 4 IU/kg every 12 hours (hypercalcemia)
- Frequency
- Daily or every other day depending on indication
- References
- 0 curated + 52 from PubMed
- Clinical Trials
- 87 registered
- Evidence Score
- 0.7 / 100
Frequently Asked Questions about Calcitonin
What is Calcitonin?
Calcitonin is a 32-amino-acid peptide hormone produced by parafollicular C-cells of the thyroid gland that regulates calcium homeostasis and bone metabolism. Salmon calcitonin (salcatonin) is FDA-approved for treatment of osteoporosis Paget's disease and hypercalcemia and has been used clinically for decades. Calcitonin has a well-established clinical evidence base from its bone disease applications and is additionally studied for analgesic effects in bone pain and as a reference compound for understanding bone mineral metabolism.
How does Calcitonin work?
Calcitonin acts through the calcitonin receptor (CTR) a G-protein-coupled receptor expressed primarily on osteoclasts — the bone-resorbing cells. CTR activation rapidly inhibits osteoclast activity reducing bone resorption and lowering blood calcium. In the kidneys calcitonin increases calcium and phosphate excretion further reducing serum calcium. The net effect is protection against hypercalcemia and prevention of excessive bone resorption. Salmon calcitonin is approximately 40-50 times more potent than human calcitonin at the receptor due to structural differences and is the form used therapeutically. Beyond calcium regulation calcitonin has central analgesic effects particularly for bone pain — mediated through calcitonin receptors in the central nervous system and modulation of endorphin systems — that are independent of its effects on bone metabolism.
What is the recommended dosage for Calcitonin?
The typical dose is 100-200 IU daily (osteoporosis), 4 IU/kg every 12 hours (hypercalcemia). Daily or every other day depending on indication. Administration: Subcutaneous or intramuscular injection, or intranasal spray (Miacalcin). Intranasal formulation is most commonly used for osteoporosis — 200 IU daily alternating nostrils. Injectable forms used for acute hypercalcemia. Resistance can develop with long-term use due to receptor downregulation.
What are the side effects of Calcitonin?
Nausea and vomiting (common with injectable form). Facial flushing (common, transient). Nasal irritation with intranasal use (common). Hypocalcemia at high doses (uncommon). Potential increased malignancy risk with long-term use (controversial — under review)
What is the Calcitonin cycle protocol?
Calcitonin is typically cycled continuous. Resistance develops with long-term use; consider breaks
Questions reflect common community inquiries. This is not medical advice.