Khavinson BioregulatorTarget: ParathyroidEndocrine

Bonothyrk

Bonothyrk A-21 · Parathyroid Cytomax · A-21 Bioregulator · Бонотирк

Bonothyrk is the Cytomax parathyroid complex - calcium-phosphate axis tissue, not thyroid hormone and not teriparatide (PTH 1-34). People mix up Bonothyrk and Thyreogen because both live in the neck. They are different glands.

Not FDA-approved - research chemical

Reviewed by CalcMyPeptide Editorial Team

·Last updated: August 2026·Evidence: Low·7 peer-reviewed citations

Typical research dose

1-2 capsules/day

Frequency

1-2× daily for 10-30 day cycles

Half-life

Variable (oral peptides absorbed via GI tract)

Common vials

N/A (oral)

CAS

N/A (biological extract, not a single compound)

Molecular weight

Mixture (<5 kDa, short-chain di- and tripeptides)

Use-case scores

0–10 against the evidence we have, not a gym ranking. Hidden domains do not apply here.

Longevity / aging3.5/10
Khavinson-school tissue peptide. Single-lab concentration after haircut. Not a Western Phase 3 geroprotector.

Compound card

Sequence: Parathyroid glands peptide complex (mixture, not a single CAS)
Class: Khavinson Cytomax capsule complex (Parathyroid glands)
Formula: Polypeptide extract (Parathyroid gland tissue, <5 kDa)
Status: Not FDA-approved · research use

How it works

Bonothyrk (A-21) is a natural Cytomax - a purified polypeptide complex extracted from the parathyroid glands of young calves using Professor Vladimir Khavinson's patented low-temperature filtration method. The resulting short-chain peptides (under 5 kDa) act as tissue-specific epigenetic regulators for the parathyroid chief cells.

**The Parathyroid's Critical Role** Your four parathyroid glands, each roughly the size of a grain of rice tucked behind your thyroid, are among the most physiologically critical structures in the body. Their one job: maintaining blood calcium and phosphate within extremely narrow bounds essential for cardiac function, nerve signaling, muscle contraction, and skeletal integrity.

They do this via Parathyroid Hormone (PTH) - the master calcium regulator. When calcium drops, PTH rises to pull calcium from bone, increase kidney reabsorption, and activate Vitamin D (which then drives intestinal calcium absorption). When calcium is adequate, PTH falls. This feedback loop is extraordinarily precise. When it fails - through aging, vitamin D deficiency, or glandular dysfunction - cascading consequences follow.

**Age-Related Parathyroid Dysfunction** As we age, two problematic patterns emerge: 1. **Secondary hyperparathyroidism** - chronically elevated PTH (often from Vitamin D deficiency) continuously leaches calcium from bone, driving osteoporosis, fracture risk, cardiovascular calcification, and kidney strain. 2. **Hypoparathyroidism** - inadequate PTH from glandular atrophy leads to hypocalcemia, severe muscle cramping, cardiac arrhythmias, and neurological symptoms.

Bonothyrk addresses this by restoring healthy parathyroid chief cell function at the gene expression level - not by providing PTH itself, but by helping the glands produce the right amount autonomously.

**Mechanism of Action** Bonothyrk's peptides penetrate parathyroid chief cell nuclei, binding to chromatin to unwind silenced gene regions and restore the transcriptional programs governing PTH synthesis, calcium-sensing receptor (CaSR) expression, and phosphate homeostasis. This epigenetic restoration is the hallmark of all Khavinson Cytomaxes - it does not override the body's feedback loops but restores the gland's own capacity to self-regulate.

**Skeletal System Integration** Bonothyrk is specifically listed in Khavinson's locomotor apparatus stack (A-4 Sigumir + A-3 Ventfort + A-6 Vladonix + **A-21 Bonothyrk**), recognizing that bone health requires healthy cartilage AND healthy calcium regulation simultaneously. Sigumir rebuilds bone/cartilage tissue; Bonothyrk ensures the PTH-calcium axis that mineralizes that tissue is properly regulated.

Source: PMID: 12677266

Khavinson map

Canonical 41

Class

Cytomax (natural peptide complex)

Organ

Parathyroid glands

Target

Parathyroid

System

Endocrine

Sequence

Mixture / not a single CAS

Pair

Adjacent: Thyreogen (thyroid Cytomax) - different gland, same neck

Бонотирк

Used in bioregulator stacks

Manufacturer-style organ combinations - not FDA protocols. Every name is a live leaf.

The Khavinson school

Vladimir Khatskelevich Khavinson (1946–2024) spent five decades at what became the St. Petersburg Institute of Bioregulation and Gerontology arguing a simple, stubborn idea: aging is, in part, a failure of tissue-specific peptide signals, and those signals can be restored. The first products were not “peptides” in the Instagram sense. They were Cytamins - polypeptide fractions isolated from a named organ of young animals. Later commercial refinements of those fractions are sold as Cytomaxes (Cytomed / NPCRIZ): still mixtures, still oral capsules, still defined by the source organ rather than a single sequence. When the group identified short active motifs inside those mixtures, they synthesized them as Cytogens - di-, tri-, and tetrapeptides with a one-letter code (KE, AEDG, KED, EDR, KEDP, and so on).

That three-layer stack is the whole map. Cytamin / pharmaceutical extracts (Thymalin, Epithalamin, Cortexin, Retinalamin, Prostatilen) are the clinic-era injectables registered in the former Soviet pharmacopeia. Cytomaxes are the capsule complexes Cytomed still lists as a 21-SKU organ line. Cytogens are the defined synthetics. English-language educators, including Brenden Henry’s public writing at Peptide Science Institute, add a further commercial distinction - later analog SKUs (N-acetyl, amidate, “V2” complexes) sold as more stable or more diverse than the original Cytomed lots. That last layer is a product taxonomy, not a Khavinson paper. We describe it so readers are not gaslit by three bottles with the same organ name. We do not reproduce paid Peptide Mastery protocols, Precision Cell Method language, or anyone else’s course IP.

Full Cytamin → Cytomax → Cytogen map, literature limits, and how we counted 41

The mechanism Khavinson published is epigenetic, not receptor-agonist in the GLP-1 sense. Short peptides are claimed to enter nuclei, interact with DNA/histones, and reopen tissue-specific transcription that condensed with age (heterochromatin → euchromatin). Reviews in the Bulletin of Experimental Biology and Medicine and Neuroendocrinology Letters (PMID 14523363, 15677927, 23888677) are the citable core. Complementary GI pharmacology is not mystical: di- and tripeptides are PEPT1/LAT substrates, which is why oral capsules are even a conversation. What is not established in Western Phase 3 programs is organ-by-organ disease treatment, telomere reversal as a clinical endpoint, or the manufacturer claim that Cytomax is “a third stronger” than Cytogen. Those are NPCRIZ marketing sentences.

Khavinson’s group published hundreds of papers, many in Russian, many in the same journal family. That is a real literature. It is also a literature with limited independent Western replication, small n, and a habit of using one review PMID as a stamp on every organ. On this site a leaf earns its organ story, its Cytomax↔Cytogen pair, its sequence if it has one, and an honest sentence about what has not been shown. Reconstitution math belongs on cytogens sold as vials. Cytomax capsules do not get a fake 5 mg vial.

The 41 we treat as canonical are the 21 Cytomaxes on the public e-peptide/Cytomed list, the 12 Cytogens on that same commercial line (including Vesilut, which Western catalogs often drop), plus eight historically load-bearing molecules that sit beside the capsule SKUs: Epitalon, Vilon, Thymogen, Livagen, Cortagen, Prostamax, Thymalin, and Epithalamin. Honluten, Cortexin, Retinalamin, Prostatilen, Thymulin, N-acetyl-epitalon-amidate, Pinalex, and the GPL Man / GPL Femme kits are covered as adjacent - same school or same storefront, not padded into a fake 41.

Public English-language teaching (including Brenden Henry at peptidescienceinstitute.com) is cited as context, not copied. Paid Peptide Mastery / Peptide Salvation text stays theirs.

History of this molecule

Parathyroid peptide bioregulation is one of the more precise Cytomax ideas: four tiny glands that set calcium, phosphate, and bone turnover via PTH. A tissue complex aimed at parathyroid cells is a bet on those cells’ transcriptional identity, not a bet on injecting PTH.

Teriparatide (Forteo) and abaloparatide are the Western anabolic bone drugs. Bonothyrk is not a 1-34 analog. If a page compares them, compare honestly: one has Fracture Prevention Trial data; the other has Khavinson organ-logic and a capsule SKU.

Thyreogen is thyroid. Bonothyrk is parathyroid. Mixing TSH and PTH on one bottle is how buyers get lost. Calcium, PTH labs, and DEXA still belong to endocrinology.

Caveats

Parathyroid Cytomax is not a US dietary-supplement monograph and not a drug. The tissue-extract model means lot-to-lot composition is a fingerprint, not a single CAS number. English-language “V2” bottles that claim more peptide diversity are a later commercial layer (mass-spec marketing from specific brands) - they are not Khavinson’s 1990s papers. Animal-source capsules are inappropriate if the reader has a religious or allergy constraint on the source species. None of this replaces care for the actual organ disease. Hypercalcemia and hypoparathyroidism are lab diagnoses. A capsule is not cinacalcet and not calcitriol.

Full 41-map: Khavinson bioregulators index · Bioregulator stacks

Research Use Cases

✓Parathyroid Health & PTH Regulation: High
✓Bone Mineral Density & Osteoporosis Prevention: High
✓Muscle Cramping & Neuromuscular Function: Moderate
✓Cardiovascular Protection: Moderate

Dosing

Phase	Dose	Frequency	Notes
Mini-Course / General Preventive (1 box)	2 capsules (20 mg)	Once daily for 10 days (20 caps total = 1 box)	Per Vita-Stream/Khavinson protocol: standard mini-course. Repeat every 6 months for general skeletal and calcium support. Take 30 minutes before meals. A 60-cap box extends this to a full 30-day course at 2 caps/day.
Full Monthly Course (ages 40–50)	2 capsules (20 mg)	Twice daily for 30 days (120 caps total = 2× 60-cap boxes)	Full 30-day bi-annual course from age 40–45. After 50, consider 3 courses/year. Pairs strongly with Sigumir (A-4) for comprehensive skeletal support. Ensure adequate Vitamin D3 + K2 baseline. Take 30 minutes before meals (morning + evening).
Intensive / High-Need Protocol	2 capsules (20 mg)	Twice daily, repeated monthly as needed	For diagnosed secondary hyperparathyroidism, significant osteoporosis, or post-surgical hypoparathyroidism support. Physician supervision strongly recommended. Combine with Ventfort (A-3) for vascular protection and Vladonix (A-6) for immune support. Maximum: 4 capsules/day (40 mg).

Administration

Route / form

Oral capsules - swallowed with water. Cytomed Cytomaxes ship as capsules, not sublingual tablets and not lyophilized research vials.

Timing

Morning, with water, about 30 minutes before meals (empty stomach).

Empty stomach?

Yes - Empty stomach - about 30 minutes before meals. Cytomed boxes sometimes print “with food” because they are labeled as supplements; the manufacturer user-guide preference is before meals for absorption.

Bonothyrk: Not a research vial vs Oral capsule

Not a research vial

Bioavailability

Not applicable. This Cytomax SKU is not sold as a lyophilized research vial. There is no SubQ F% because Cytomed does not ship this complex as a cake.

Dose note

Do not reconstitute Bonothyrk. No BAC-water chart, no 5 mg vial math, no units-on-a-U-100 conversion. No dedicated cytogen on the 12-SKU NPCRIZ poster (none - do not invent a PTH cytogen; Thyreogen is thyroid, different gland). Do not invent one. There is no pharmaceutical-extract SKU that is this capsule in a syringe.

Advantages

No dedicated cytogen on the 12-SKU NPCRIZ poster (none - do not invent a PTH cytogen; Thyreogen is thyroid, different gland). Do not invent one.
There is no pharmaceutical-extract SKU that is this capsule in a syringe.
Not teriparatide (PTH 1-34). Not a Thyreogen vial with the name swapped. There is no parathyroid cytogen on the 12-SKU poster.

Considerations

Bonothyrk is an oral capsule complex. It is not a 5 mg lyophilized research vial.
Inventing recon math for a zero-mg Cytomax vial is how people inject the wrong product.
Not an official Cytomed sublingual tablet, IM ampoule, or eye drop either.

Oral capsule

Bioavailability

Not quantified in a Western PK study. Official Cytomed form is a swallowed capsule. PEPT1/LAT transport is class biology for short peptides, not an F% for this tissue mixture.

Dose note

Typical Cytomed labeling: 1–2 capsules daily in 10–30 day courses, swallowed with water about 30 minutes before meals (empty stomach). Manufacturer protocol, not an FDA label. Some boxes print “with food” because they are labeled as supplements; the timing copy we use is before meals.

Advantages

Official form for Bonothyrk: swallow the capsule with water. No reconstitution step and no 5 mg cake.
Parathyroid Cytomax (Cytomed A-21): calcium-phosphate axis tissue. Adjacent anatomy to Thyreogen (thyroid), different hormone.
Course-based (10–30 days, a few times a year in manufacturer folklore), not a daily forever drug.

Considerations

Parathyroid Cytomax is a peptide mixture / lot fingerprint, not a single CAS. English “V2” bottles are a later commercial layer, not a Khavinson RCT.
Russian school literature is not an FDA organ-disease label.
Third-party lingual SKUs exist in the wild. We do not claim sublingual as the official Cytomed Cytomax form.

Recommendation: Swallow Bonothyrk as oral capsules with water, about 30 minutes before meals. Parathyroid Cytomax, not Thyreogen, not levothyroxine, and not teriparatide. No dedicated PTH cytogen on the 12-SKU NPCRIZ poster. Hypercalcemia is a lab diagnosis, not a 20-day course.

Timeline

Days 1–7

Peptides begin binding to parathyroid chief cell chromatin; initial restoration of calcium-sensing receptor (CaSR) expression underway.

Weeks 2–4 (during course)

Normalization of PTH synthesis capacity. Users report reduced muscle cramping and improved energy if hypocalcemia was contributing to symptoms.

Months 1–3 (post-course)

Peak benefit period for calcium homeostasis restoration. Bone mineral density improvements take longer - expect to see DEXA improvements at 6–12 months when combined with Sigumir and D3/K2.

Months 4–6

Long-lasting epigenetic changes persist. PTH self-regulation improved. Skeletal system benefits accumulate with repeated courses.

Who it is for

Parathyroid Health & PTH Regulation

High

Primary target tissue. Restores age-suppressed parathyroid chief cell function for proper PTH secretion and calcium/phosphate balance.

Bone Mineral Density & Osteoporosis Prevention

High

Dysregulated PTH is a primary driver of bone loss. Bonothyrk addresses the hormonal root cause when paired with Sigumir for structural bone support.

Muscle Cramping & Neuromuscular Function

Moderate

Low calcium (from parathyroid dysfunction) causes severe muscle cramps and weakness. Bonothyrk supports the calcium regulation that prevents this.

Cardiovascular Protection

Moderate

Chronic elevated PTH promotes vascular calcification and cardiac hypertrophy. Normalizing PTH is cardioprotective. Pairs well with Ventfort (A-3).

Kidney Health

Moderate

Excess PTH increases renal calcium reabsorption stress and kidney stone risk. PTH normalization reduces this burden.

Aging / Longevity Protocol

High

Essential component of the Khavinson locomotor stack. Calcium dysregulation accelerates aging across multiple systems; Bonothyrk addresses this upstream.

Safety & Considerations

Bonothyrk is a natural glandular Cytomax with a 40+ year safety record in Russian clinical practice. It contains no actual PTH hormone and no synthetic analogs. The strict <5 kDa molecular weight filtration removes DNA fragments, prions, and immunogenic material. Important: Because PTH regulation is critical to cardiac and neuromuscular function, individuals with diagnosed parathyroid disorders (hyperparathyroidism, hypoparathyroidism) should use Bonothyrk under physician supervision with regular calcium/PTH blood monitoring. Contraindications per manufacturer: individual intolerance of components, pregnancy, and lactation. Drug interactions: No known direct interactions, but inform your physician if you are on calcium supplements, bisphosphonates, cinacalcet, vitamin D analogs, or cardiac medications - all of which interact with calcium metabolism. Storage: Keep in a dry, dark place between +2°C and +25°C.

Regulatory & Legal Status

FDA Status (US)

Research Only

WADA Status (2026)

Not Listed

Not currently on the WADA 2026 Prohibited List. Policies may change - verify before competition.

Classification

Research Chemical

US Compounding: Not eligible / not available

⚠️ This information is for educational purposes only and may not reflect the most current regulatory updates. Always verify with official FDA, WADA, and jurisdiction-specific sources before use.

Limits of current evidence

Cytomax SKUs are oral capsules. Do not run SubQ reconstitution math on a zero-mg vial.
Lot-to-lot composition is a fingerprint, not one sequence.
This site will not treat the named organ disease from a peptide page.
English-language V2 / analog bottles are a later commercial layer, not a Khavinson RCT.

Verdict

Bonothyrk is a Cytomax capsule complex from Parathyroid glands. It is not the paired cytogen, not a 5 mg research cake, and not a US supplement monograph. The organ story is in the dossier on this page.

Interactions & Contraindications

Frequently Asked Questions

Oral capsule or injection?▼

Bonothyrk is a Cytomax oral capsule: swallow with water, about 30 minutes before meals. It is not a 5 mg lyophilized research vial and not an official Cytomed sublingual tablet (third-party lingual SKUs exist in the wild). If you want a defined-sequence powder to reconstitute, that is the cytogen pair (none on the 12-SKU poster - do not invent a PTH cytogen), not this complex. Do not run BAC math on a capsule SKU. Thyreogen is thyroid, different gland. This is not teriparatide.

Bonothyrk vs Thyreogen?▼

Bonothyrk = parathyroid Cytomax (calcium axis). Thyreogen = thyroid Cytomax (T3/T4 tissue). Adjacent anatomy, different hormones.

Is this teriparatide?▼

No. Teriparatide is recombinant PTH 1-34, FDA-approved for osteoporosis. Bonothyrk is a parathyroid tissue peptide complex.

Is there a parathyroid cytogen?▼

Not on the public 12-SKU NPCRIZ cytogen list. Do not relabel Testagen or Thyreogen as PTH.

Capsule reconstitution?▼

No. Oral complex. No vial math.

What is Bonothyrk A-21 and what does it do?▼

Bonothyrk (A-21) is a natural Cytomax peptide bioregulator derived from parathyroid gland tissue, developed by Prof. Vladimir Khavinson. It supports the structural and functional health of the parathyroid glands - the four tiny glands behind your thyroid that regulate blood calcium and phosphate levels. It works by restoring healthy parathyroid cell gene expression, helping the glands self-regulate PTH production correctly.

Does Bonothyrk contain parathyroid hormone (PTH)?▼

No. Bonothyrk contains short-chain peptides (<5 kDa) derived from parathyroid tissue, but the strict filtration process removes all actual hormones, DNA material, and immunogenic substances. It signals your own parathyroid glands to normalize PTH production - it does not replace PTH exogenously. This makes it fundamentally different from pharmaceutical PTH analogs like teriparatide.

How does Bonothyrk support bone health?▼

Chronically elevated PTH (secondary hyperparathyroidism - very common in aging adults with low Vitamin D) is one of the primary drivers of bone density loss. It continuously signals osteoclasts to resorb bone to liberate calcium into the blood. Bonothyrk aims to normalize PTH secretion, removing this constant bone-resorption signal. For full bone health, pair with Sigumir (A-4, cartilage/bone structural support) and ensure adequate Vitamin D3 + K2 intake.

Who might benefit most from Bonothyrk?▼

Ideal candidates include: (1) adults over 45–50 with low Vitamin D and suspected secondary hyperparathyroidism (confirmed by elevated PTH on bloodwork); (2) those with osteoporosis or low bone density; (3) individuals experiencing muscle cramping, weakness, or numbness that may relate to calcium dysregulation; (4) post-menopausal women (estrogen drop worsens calcium metabolism); (5) anyone on a comprehensive Khavinson anti-aging Cytomax stack targeting skeletal longevity.

What peptides pair well with Bonothyrk?▼

Per Khavinson's protocols: Sigumir (A-4) for structural bone and cartilage support, Ventfort (A-3) for blood vessel health and cardiovascular protection from PTH excess, and Vladonix (A-6) for immune axis support. This locomotor stack is specifically listed in Khavinson's clinical recommendations. You can safely combine up to 5 Cytomaxes simultaneously.

Should I monitor blood calcium or PTH levels while taking Bonothyrk?▼

For preventive use in healthy individuals, routine monitoring is not strictly required but provides useful baseline data. If you have a diagnosed parathyroid condition or take medications affecting calcium metabolism (bisphosphonates, calcitonin, diuretics, calcium channel blockers), physician supervision with regular calcium/PTH bloodwork is strongly recommended. Khavinson's research approach emphasizes objective laboratory measurement before and after peptide courses.

References

Khavinson VKh et al. “Tissue-specific effects of peptides.” Bulletin of Experimental Biology and Medicine (2005). PMID: 15677927
Khavinson VKh, Lin’kova NS, Tarnovskaya SI “Short peptides regulate gene expression.” Bulletin of Experimental Biology and Medicine (2013). PMID: 23888677
Khavinson VKh, Morozov VG “Peptide regulation of aging: from experimental studies to clinical practice.” Advances in Gerontology (2003). PMID: 14523363
Khavinson VKh “"Peptide bioregulators - a new class of geroprotectors".” Bulletin of Experimental Biology and Medicine (2002). PMID: 12677266
Khavinson VKh, Anisimov VN “"Peptide regulation of aging".” Rejuvenation Research (2007). PMID: 17516852
Khavinson VK et al. “"Short peptides: nature, biosynthesis, and properties".” Advances in Gerontology (2019). PMID: 30641757
Khavinson VK, Morozov VG “"Regulatory peptides and the aging process".” Neuroendocrinology Letters (2003). PMID: 14618157

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