Teriparatide (PTH 1-34)

FDA Approved

PTH(1-34) | Bone-Building Anabolic Peptide

Weight: 4,118 Da
Half-life: ~1 hour (subcutaneous); ~5 minutes (intravenous)
Chain: 34 amino acids
4 studies
2024 latest
Extensively Studied
Dose 20mcg daily (FDA-approved dose)
Frequency Once daily at same time each day
Cycle Maximum 2 years lifetime treatment
Storage Pen: 2-8°C refrigerated, do not freeze. Discard after 28 days
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Community Research

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Teriparatide is an FDA-approved anabolic bone-building agent consisting of the first 34 amino acids of parathyroid hormone. Unlike antiresorptive osteoporosis drugs that slow bone loss, teriparatide actively stimulates new bone formation. The key to its mechanism is intermittent exposure: while continuous PTH causes bone resorption, daily injections stimulate osteoblasts more than osteoclasts, resulting in net bone formation. Clinical trials show 8% spine bone density increases and 65% reduction in vertebral fractures.

Mechanism of Action

Teriparatide binds to PTH type 1 receptors (G-protein coupled receptors) on osteoblasts, osteocytes, and renal tubular cells. This activates PKA and PKC signaling pathways that promote osteoblast activity. The intermittent daily dosing creates an 'anabolic window' where bone formation exceeds resorption. Teriparatide upregulates IGF-1 and FGF2 expression, stimulates bone formation on trabecular and cortical surfaces, and increases bone mineral density through preferential osteoblast stimulation.

01 FDA-approved for osteoporosis treatment
02 Actively builds new bone (anabolic)
03 Increases spine bone density by 5-9%
04 Reduces vertebral fracture risk by 65%
05 Reduces nonvertebral fractures by 35%
06 Works differently than antiresorptive drugs
07 Benefits seen within 3 months
08 Creates 'anabolic window' for bone growth

Molecular Data

Molecular Weight
4,118 Da
Chain Length
34 amino acids
Type
Recombinant PTH fragment
Amino Acid Sequence
N-terminal 1-34 of parathyroid hormone

Complex or non-standard sequence format

Peak 0.0 mcg
Trough 0.0 mcg
SS Peak 0.0 mcg
SS Trough 0.0 mcg

Research Indications

Osteoporosis (FDA-Approved)
Postmenopausal Osteoporosis most effective

FDA-approved for women with osteoporosis at high risk of fracture.

Male Osteoporosis most effective

FDA-approved for men with primary or hypogonadal osteoporosis at high risk.

Glucocorticoid-Induced Osteoporosis effective

FDA-approved for men and women with osteoporosis from sustained corticosteroid use.

Bone Health Research
Fracture Healing moderate

Research interest in accelerating fracture healing and bone repair.

Dental Bone Regeneration moderate

Investigated for jawbone regeneration in dental applications.

Dosing Protocols

Teriparatide is administered as a once-daily subcutaneous injection, typically in the thigh or abdomen. It comes in pre-filled pen devices (Forteo) containing a 28-day supply. Treatment is typically limited to 2 years due to theoretical bone cancer risk from long-term use (seen only in rats at high doses).

GoalDoseFrequencyRoute
Osteoporosis treatment20 mcgOnce dailySubQ (thigh or abdomen)

Reconstitution Instructions

Materials Needed:
  • Pre-filled pen device (Forteo)
  • Pen needles
  • Alcohol swabs
  1. 1 Store pen refrigerated (do not freeze)
  2. 2 Allow to reach room temperature before injection
  3. 3 Attach new needle for each injection
  4. 4 Inject subcutaneously in thigh or abdomen
  5. 5 Discard pen after 28 days even if medication remains

Interactions

?
Bisphosphonates
Antiresorptive agents often needed after teriparatide to maintain bone gains. Can be used sequentially.
sequential
++
Calcium/Vitamin D
Adequate calcium and vitamin D intake recommended during teriparatide therapy.
synergistic
+
BPC-157
Different mechanisms; no known interactions.
compatible
+
TB-500
Different mechanisms; no known interactions.
compatible

What to Expect

Month 1-3
Bone formation begins; spine BMD increases
Month 3-6
Continued bone density improvements
Month 6-12
5-9% spine BMD increase; fracture risk reduction
Year 1-2
Maximum benefits achieved; transition to maintenance

Side Effects & Safety

Common Side Effects

  • Injection site reactions
  • Nausea
  • Headache
  • Leg cramps
  • Dizziness
  • Joint pain

Stop Signs - Discontinue if:

  • Signs of hypercalcemia (confusion, fatigue, nausea)
  • Persistent bone pain
  • Allergic reactions

Contraindications

  • Paget's disease of bone
  • Prior skeletal radiation therapy
  • History of skeletal malignancies
  • Metabolic bone diseases other than osteoporosis
  • Pre-existing hypercalcemia
  • Pregnancy

Quality Checklist

Good Signs

  • Clear, colorless solution
  • Pharmaceutical grade (Forteo)
  • Proper cold chain maintained
  • Intact pen device

Warning Signs

  • Research-grade products lack FDA oversight
  • Temperature excursions may affect potency

Bad Signs

  • Cloudy or discolored solution
  • Particulates visible
  • Exposed to freezing or high temperatures

References

  • Teriparatide
    StatPearls (NCBI Bookshelf) (2024)

    Intermittent PTH exposure induces bone formation more than resorption; FDA-approved for osteoporosis.

  • The effect of teriparatide therapy on bone density in men with osteoporosis
    PubMed (2002)

    Spine BMD increased 5.9% (20mcg) and 9.0% (40mcg); femoral neck increased 1.5-2.9%.

  • Teriparatide: 2.5 Years of Experience
    Journal of Bone and Mineral Research (2006)

    Reduced vertebral fractures by 65% and nonvertebral fractures by 35% after 20 months.

  • Parathyroid Hormone (1-84) and Teriparatide in Postmenopausal Osteoporosis
    Women's Health (2006)

    Initial formation without resorption creates 'anabolic window' for rapid bone volume increase.

Related Peptides

BPC-157 compatible

Different mechanisms; no known interactions.

TB-500 compatible

Different mechanisms; no known interactions.

Disclaimer

This information is for educational and research purposes only. Consult a healthcare professional before use.