Growth hormone is not one molecule in the body

Published 24 October 2026 · REVIVE LAB UAE Research Desk · 5 min read
Human growth hormone circulates as a mixture of forms. The principal one is a 191-residue chain of about 22 kDa, and recombinant somatropin reproduces that form — which is why the chain length appears on the label.

More than one form in circulation

The pituitary releases growth hormone in several molecular forms, including a well-described shorter variant of about 20 kDa produced by alternative splicing, alongside the principal 22 kDa chain. They are not present in equal amounts and they are not identical in behaviour.

A preparation reproducing one form is therefore not reproducing circulating growth hormone as a whole, and no honest description claims it does.

Why the label states a chain length

Because it identifies which form. "191AA" distinguishes the full-length principal chain from a variant or a fragment, and fragments are sold separately as their own research materials with their own literature.

A specification that lets a buyer tell those apart is doing its job. One that says only "growth hormone" is not.

What that means when comparing work

Results generated with one form do not automatically describe another, and the papers are generally specific about which preparation was used. Published work is generally specific about which preparation was used, and results obtained with one form are not evidence about another.

Somatropin 191AA, 24 mg, with identity confirmed by mass spectrometry and purity by HPLC for the batch. Research use only.

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

More than one form in circulation?

The pituitary releases growth hormone in several molecular forms, including a well-described shorter variant of about 20 kDa produced by alternative splicing, alongside the principal 22 kDa chain. They are not present in equal amounts and they are not identical in behaviour.

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.