How Many GOURI Sessions, How Far Apart — Three Numbers That Disagree

The same pages that carry “3–4 sessions at 3–4 week intervals” also carry figures such as “lasts 9–12 months,” and those too disagree with the manufacturer’s official FAQ. It has the look of sentences repeated without attribution, citing one another until they hardened. Where the duration figures came from is set out separately in GOURI — from the day of injection to months later.

There are two logics for setting an interval. One is to see the effect of the previous session before deciding on the next; the other is to keep the stimuli from overlapping.

Following the first logic for GOURI, four weeks is early. The earliest change recorded in the literature is at 4 weeks (2 people, the time of photography), and the earliest confirmed collagen increase in tissue is 6 weeks in animals. In other words, the face at 4 weeks is not the whole of what this product will produce. Deciding at that point that “it hasn’t worked” and adding a session means treating change that has not yet arrived as though it never will, and increasing the number of sessions on that basis.

That said, there is no basis for asserting from this logic that “you must therefore leave six weeks or more.” No study has compared different intervals. The manufacturer’s 4–6 weeks should be read within that range.

Compared with other products

The difference visible in this table matters. The session counts for Sculptra, Radiesse and Rejuran are numbers that came out of trial protocols — meaning they were trialled at that number of sessions and produced that result. GOURI’s session count came out of manufacturer guidance, and no trial comparing outcomes by number of sessions stands behind it. Sessions and intervals by class are set out together in how many sessions and how long does it last.

We decide from the condition of the skin, not from the calendar. There is a reason in the data for putting it that way. The longest time point observed in humans for GOURI is six months, and beyond that it has never been measured. So a sentence like “come back at nine months” has no observation behind it.

The commonly cited 6–12 months is how long the material takes to break down, not how long the effect lasts. The time it takes for a material to disappear from the body and the period during which you look better in the mirror are different things, and there is no data connecting the two concepts.

So the way we set the timing of a repeat is this: we do not judge before 4 weeks after the first session; we look at the condition again at around six months; and we decide on anything further from the state of the skin at that time. Because the material is irreversible, when it is borderline we choose to defer.

“I had one session, I’m not sure about it, so I want more” is the most frequent line of thought in consultation. There are three things to check here.

• Whether the moment of judgement came too early. What is raised straight after the treatment is not polycaprolactone but the water injected plus oedema from the injection, and it is common to read its disappearance as “the effect has gone.”
• That self-assessment itself is unstable. At 90 days after treatment, the proportion recognising improvement was 92% among practitioners versus 42% among patients, and at one year the direction reversed — 43% among blinded observers versus 95–100% patient satisfaction. Looking in the mirror every day adapts the eye to change (visual adaptation, 48 people), and the way we view mirror images versus photographs also distorts judgement (in a 198-person study, 56.6% preferred the mirror image of a selfie). So we talk from photographs taken under the same conditions. Judgement timing in general is set out in when improvement shows, and when to judge it.
• Whether the treatment was pointed the right way. Repeating a collagen booster for change caused by lost volume means the wanted result does not arrive however many sessions are added. That distinction is written out in which skin is GOURI suited to.

When GOURI is combined with other treatments, one more interval enters the picture. There are two principles we actually keep to.

We defer layering irreversible materials in the same area. Injecting again into a site that already contains PCL, PLLA or CaHA makes it impossible to tell what caused a problem later.

We leave a gap so the cause can be distinguished. The practical reason for not scheduling around a vaccination or dental work is the same — delayed inflammatory reactions are reported across fillers at an incidence of 0.3–4.25%, with infection, vaccination and biofilm proposed as triggers, so overlapping timing makes it impossible to identify the cause. That said, we could not find data proposing a recommended interval.

Written and reviewed by Lee Chi-Hak, MD, medical director of Miso Clinic in Daegu, South Korea. Every study cited above is given together with its design, its size and the limitations the authors themselves recorded, and where we could not find data, we have said that we could not find any.