The one metabolic action of growth hormone that is strong, fast and independent of IGF-1

Published 26 October 2026 · REVIVE LAB UAE Research Desk · 5 min read
Growth hormone acts directly on adipocytes to increase lipolysis: it enhances the activity of hormone-sensitive lipase and reduces lipoprotein lipase, so stored triglyceride is broken down and free fatty acids and glycerol enter the blood. The effect appears within two to three hours of a pulse and does not require IGF-1, which if anything opposes it. It is the mechanism behind the fat loss recorded in the body composition trials and behind the insulin resistance, since the fatty acids displace glucose as fuel.

The mechanism

The receptor on fat cells signals through JAK2 and STAT5 as elsewhere, and also through pathways that raise cyclic AMP and sensitise the cell to catecholamines. Hormone-sensitive lipase is activated, the lipid droplet coat protein perilipin is phosphorylated, and triglyceride is hydrolysed. Lipoprotein lipase, which stores fat from circulating lipoproteins, is suppressed. The net direction is out of the cell.

Visceral fat is more responsive than subcutaneous, which bears on the trial findings.

The physiological role

During fasting, growth hormone rises and insulin falls; the hormone mobilises fat so that glucose is spared for the brain and protein is spared from breakdown. This fuel-switching role is considered its primary metabolic function in adults, distinct from the growth function in children. Sleep, when the largest pulse occurs, is a daily fast.

Blocking lipolysis experimentally abolishes much of the insulin resistance the hormone causes, which confirms the link.

In the trial data

The modest fat reduction pooled in the 2007 review is this mechanism at work over months, and the glucose effects recorded alongside are its cost. The two are one phenomenon seen from two sides.

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.

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Frequently asked

The mechanism?

The receptor on fat cells signals through JAK2 and STAT5 as elsewhere, and also through pathways that raise cyclic AMP and sensitise the cell to catecholamines. Hormone-sensitive lipase is activated, the lipid droplet coat protein perilipin is phosphorylated, and triglyceride is hydrolysed. Lipoprotein lipase, which stores fat from circulating lipoproteins, is suppressed. The net direction is out of the cell.

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