The human study that separated what growth hormone does to tendon from what it does to muscle

Published 26 October 2026 · REVIVE LAB UAE Research Desk · 5 min read
Doessing and colleagues gave growth hormone or placebo to healthy young men for two weeks and measured protein synthesis directly, with stable isotope tracers and biopsies of patellar tendon and thigh muscle, at rest and after exercise. Collagen synthesis in both tendon and muscle rose severalfold with the hormone. Synthesis of myofibrillar protein — the contractile machinery — did not change. The result explains why trials find lean mass but not strength: the hormone builds the connective tissue matrix, not the contractile protein, and it is consistent with the acromegaly phenotype of enlarged connective tissue without proportionate strength.

The method

Labelled amino acids infused and their incorporation into protein measured in tissue samples give a direct rate of synthesis for specific protein fractions. Separating collagen from myofibrillar protein in the same biopsy lets the two be compared. The study also measured markers of collagen turnover in blood and the response to a bout of exercise, which itself raises collagen synthesis.

A small study in a specialised laboratory; the method is laborious and the result clear.

What it explains

The lean-mass gain in every growth hormone trial includes water and connective tissue, not only or mainly contractile muscle. Strength does not improve because the proteins that generate force are not increased. The hormone has a real anabolic effect on the matrix, which is why the collagen marker P-III-NP rises and is used in detection, and why tendon and joint symptoms are common adverse effects.

It also frames the interest in the hormone for connective tissue injury, which remains a hypothesis with little trial support.

Why it is here

Because it is a mechanistic human study that makes sense of the trial results, and because it is the kind of evidence this site exists to state. It describes no use of the pack.

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 method?

Labelled amino acids infused and their incorporation into protein measured in tissue samples give a direct rate of synthesis for specific protein fractions. Separating collagen from myofibrillar protein in the same biopsy lets the two be compared. The study also measured markers of collagen turnover in blood and the response to a bout of exercise, which itself raises collagen synthesis.

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.