Why growth hormone is released in bursts, and the two hypothalamic signals that shape them

Published 26 October 2026 · REVIVE LAB UAE Research Desk · 5 min read
Growth hormone is secreted by the anterior pituitary in discrete pulses, several in twenty-four hours, with the largest typically in the first hours of sleep. Between pulses the concentration falls to near the detection limit of most assays. Growth hormone-releasing hormone from the hypothalamus stimulates each pulse; somatostatin, also hypothalamic, inhibits release and its withdrawal permits the next one. The pattern means a single blood sample says almost nothing about growth hormone status, which is why IGF-1 is used as the integrated readout.

The two hypothalamic peptides

Growth hormone-releasing hormone, a 44-residue peptide, binds its receptor on somatotroph cells and raises cyclic AMP, releasing stored hormone and driving synthesis of more. Somatostatin, a 14- or 28-residue cyclic peptide, binds its own receptors and lowers cyclic AMP, suppressing release. The two are secreted reciprocally, and the alternation is what produces pulses.

Ghrelin from the stomach is a third input, acting through a separate receptor to amplify release.

The pattern

Pulses are larger and more frequent in adolescence and decline with age. Sleep, exercise, fasting and hypoglycaemia increase release; glucose, free fatty acids and IGF-1 itself suppress it through feedback. The amplitude and the troughs both carry information, and the pulsatility itself has been shown to matter for how target tissues respond.

Secretion is sexually dimorphic in pattern in rodents and to a lesser degree in humans.

Why this is on a product page

Because the recombinant protein in the pack is the hormone this system secretes, and the physiology is part of what is established about it. The Tesamorelin pack in this catalogue is an analogue of the upstream releasing hormone, which the page on the two levels of the axis sets out.

Somatropin is supplied by REVIVE LAB UAE for laboratory research use only, with identity and purity documented for the batch. It is not for human or veterinary use, and no dosing, administration or protocol guidance is provided.

What it costs

FormatStrengthPriceAvailability
HGH Somatropin Pack24 mg (72 IU)AED 850In stock

Delivery is AED 40 flat and free on orders over AED 700. Payment is cash on delivery anywhere in the UAE, or USDT (TRC20) in advance, which takes 5% off the order total.

Frequently asked

The two hypothalamic peptides?

Growth hormone-releasing hormone, a 44-residue peptide, binds its receptor on somatotroph cells and raises cyclic AMP, releasing stored hormone and driving synthesis of more. Somatostatin, a 14- or 28-residue cyclic peptide, binds its own receptors and lowers cyclic AMP, suppressing release. The two are secreted reciprocally, and the alternation is what produces pulses.

Does REVIVE LAB UAE provide dosing guidance?

No. REVIVE LAB UAE supplies research materials and provides no dosing, administration or protocol guidance of any kind. Every product is sold for laboratory research use only and is not for human or veterinary consumption.

How fast is delivery in the UAE?

Stock is held in Dubai. An order confirmed before 4 PM Dubai time is dispatched the same working day, reaching Dubai and Abu Dhabi the same day and the remaining emirates within 24 hours. Delivery is AED 40 flat and free over AED 700.

HGH Somatropin Pack — in stock, dispatched from Dubai
HPLC-verified, lot certificate on every carton, 24-hour delivery nationwide. Browse the catalogue → All peptides UAE

Related reading

Supplied for laboratory research use only. Not for human or veterinary consumption. REVIVE LAB UAE provides no dosing, administration or protocol guidance.