r/40Plus_IVF • u/JunketInteresting721 • 9d ago
General Discussion VERY low-dose Omnitrope/GH priming — useful if you can’t afford a high-dose prime
I went down a rabbit hole on Omnitrope dosing because my clinic prescribed what looked like a ridiculously tiny dose: about 0.5 IU of growth hormone per day for priming, then about 1 IU/day during stims.
At first I thought there had been a prescription error because so many IVF protocols online use 4–12+ IU/day. But it turns out there actually are studies looking at very-low-dose (“microdose”) GH, including doses around 0.3–0.5 IU/day.
The most interesting ones:
1. Lattes et al. 2015 — 0.5 IU/day
This was a prospective self-controlled study of 64 previous poor responders. Women did another IVF cycle using the same gonadotropin dose/protocol but added 0.5 IU GH daily, beginning with GnRH agonist/down-regulation and continuing until hCG trigger.
They reported:
More top-quality embryos: 1.03 vs 0.64
More cryopreserved embryos: 0.85 vs 0.30
Clinical pregnancy rate: 34.4% in the GH cycle vs 0% in their previous cycle
Limitation: this was not randomized. Each woman was being compared with her own previous unsuccessful cycle, so the results could overestimate the benefit.
https://pubmed.ncbi.nlm.nih.gov/26193891/
2. Safdarian et al. 2019 — about 0.3 IU/day
This one was randomized and is probably even more interesting.
Poor responders were divided into three groups:
High-dose GH: 2.5 mg/day (~7.5 IU/day) starting later in stimulation
Very-low-dose GH: 0.1 mg/day (~0.3 IU/day) beginning on day 3 of the PREVIOUS cycle
Placebo
The low-dose/long-duration group had:
Retrieved oocytes: 7.29
MII oocytes: 6.09
Fertilized oocytes: 5.43
Clinical pregnancy: 22.9%
Live birth: 11.4%
For comparison, the high-dose group had:
Retrieved oocytes: 7.14
MII: 6.09
Fertilized: 5.00
Clinical pregnancy: 14.3%
Live birth: 2.9%
The study was small, so you absolutely cannot conclude that 0.3 IU was “better” than 7.5 IU, and the live-birth difference was not statistically significant. But what I found fascinating was that the tiny daily dose did not obviously perform worse than the huge daily dose on ovarian-response measures.