Most people quit collagen at exactly the wrong moment. Here is what the published studies actually measured, and when.
The short answer
The human studies on collagen peptides and skin ran for 8 to 12 weeks. Not 7 days. Not 14. If you stop after one box, you have stopped before the point at which researchers even took their measurements.
What the studies did, week by week
Three pieces of research are worth knowing by name, because almost every collagen claim you will see traces back to work like this:
- Proksch et al., 2014 (Skin Pharmacology and Physiology). 69 women aged 35–55 took 2.5 g or 5 g of collagen peptides, or a placebo, every day for 8 weeks. Skin was measured at week 4 and week 8.
- Asserin et al., 2015 (Journal of Cosmetic Dermatology). Participants took 10 g of collagen peptides a day for 8 weeks, with skin hydration and the collagen network in the skin measured against a placebo group.
- de Miranda et al., 2021 (International Journal of Dermatology). A meta-analysis that pooled 19 studies and 1,125 participants aged 20–70. It looked at skin hydration and elasticity, and the authors noted that the benefits reported were seen with around 90 days of use.
Two things stand out. First, the doses: 2.5 g to 10 g of collagen peptides a day. Second, the timeframe: two to three months, with the first measurements usually taken at four weeks.
A realistic timeline
| When | What is realistic |
|---|---|
| Days 1–14 | Building the habit. Taste, routine, digestion. Do not judge your skin yet. |
| Day 28 | The first honest check-in. This is roughly where studies took their first measurement. |
| Weeks 8–12 | The window most studies were designed around. This is the fair point to decide whether it is working for you. |
Everyone's skin, diet, sleep and stress are different, so no product can promise you a specific result on a specific date. What you can do is give it the same time the research gave it.
Why consistency matters more than the brand
Collagen peptides are not a cream that sits on the surface. They are a daily nutrition habit. Skipping days, or switching products every two weeks, makes it impossible to know what is helping. Pick one product with a dose in the studied range, take it at the same time each day, and keep everything else in your routine steady.
Three simple habits make the biggest difference:
- Same time, every day. Attach it to something you already do, like your morning water or post-workout drink.
- Take a photo on day 1. Same window light, no filter, no makeup. Repeat on day 28 and day 56. Memory is a poor judge of slow change; photos are not.
- Don't change five things at once. A new serum, a new diet and a new supplement in the same week tells you nothing about any of them.
Where Super Glow fits
NEXXGENE Super Glow gives you 5,000 mg of hydrolysed marine collagen peptides per sachet, inside the 2.5–10 g range the studies used, with hyaluronic acid, vitamin C, astaxanthin, trans-resveratrol and probiotics alongside it. Every dose is printed on the carton.
The honest advice is the same whichever brand you choose: plan for at least 8 weeks, which is two 28-sachet packs, and judge it at the end of that window rather than at the end of the first box.
Related reading: How much collagen should you take a day? and Marine vs bovine collagen.
This article is for general information and is not medical advice. Super Glow contains fish. If you are pregnant, breastfeeding, under 18, taking medication or have a medical condition, speak to your doctor before starting any supplement. Individual results vary.
