Medically reviewed by Dr. Reina Punj, MBBS, PG Diploma in Endocrinology (University of South Wales), Lead Physician, Excelgenics Clinical Panel.
When starting a skin supplement like RADIA by Excelgenics, one of the most common and reasonable questions is:
"How long before I actually see results?"
Unlike topical skincare, which works mainly on the surface, oral skin supplements supply nutrients from within. The processes involved, such as collagen turnover and cell renewal, happen over weeks to months, so any change is gradual.
This article explains what research timelines look like, what you might reasonably expect, and where the evidence is uncertain.
In clinical trials of collagen supplements, skin was usually measured after 8–12 weeks of daily use, so allow at least that long before judging. Some people notice their skin feels more hydrated first; changes in elasticity or fine lines, if they occur, take longer. Some people notice no visible change.
Why Skin Supplements Take Time to Work
Skin health is governed by slow, regulated biological processes.
- Collagen in the skin is renewed slowly, over months
- The outer layer of skin renews itself over several weeks, more slowly with age
- Nutrient levels build up with consistent daily intake
RADIA's ingredients relate to these pathways, so any visible changes are expected over weeks rather than days.
Understanding the Skin Renewal Timeline
1. Skin Cell Turnover (Several Weeks)
The epidermis renews itself continuously over several weeks. Vitamin C and zinc contribute to the maintenance of normal skin, though a balanced diet and good skincare matter most here.
2. Collagen Remodelling (8–12 Weeks and Beyond)
Collagen sits deeper in the dermis and is renewed slowly. Its formation depends on:
- A steady supply of amino acids from dietary protein
- Cofactors such as vitamin C, which contributes to normal collagen formation for the normal function of the skin
- Protection from sun damage
This is why most collagen trials ran for 8–12 weeks before measuring firmness, elasticity and texture.
What Results to Expect — Week by Week
Weeks 1–4: Building a Routine
The main goal is consistency. Expect little visible change; some people report their skin feels less dry. Changes at this stage, if any, are often felt before they are seen.
Weeks 4–8: Hydration & Texture
If you are going to notice changes, this is when some people first describe better-hydrated-looking skin, softer texture or less dullness.
Clinical studies on marine collagen peptides have often reported hydration and elasticity changes at around 8 weeks. However, most used 2.5–10 g of collagen a day, and a 2025 meta-analysis of 23 trials found no significant benefit when only independently funded or high-quality trials were analysed. RADIA provides 500 mg of marine collagen peptides a day, well below those trial doses.
Weeks 8–12: Assessing Longer-Term Change
This is when most trials measured firmness, elasticity and fine lines, and a sensible point to judge honestly whether RADIA is worth continuing for you: has your skin texture or comfort changed more than better hydration, sleep and sun protection alone would explain?
How RADIA Differs From Basic Collagen Supplements
Many collagen supplements contain collagen alone, often as a powder at gram-level doses. RADIA combines a smaller amount of collagen with other ingredients. Per 2-capsule daily serving:
- Marine collagen peptides (type I & III) 500 mg
- Low-molecular-weight hyaluronic acid 100 mg
- Grape seed extract (95% OPC) 100 mg
- Vitamin C 65 mg
- CoQ10 60 mg
- Lycopene 10 mg, vitamin E 10 mg and astaxanthin 4 mg
- Zinc 5 mg and black pepper extract 5 mg
Vitamins C and E and zinc contribute to the protection of cells from oxidative stress. Whether the combination produces visible skin change has not been tested in a trial of RADIA itself. For more on the evidence, see our Marine Collagen Supplements Guide.
Factors That Influence How Fast You See Results
- Age and baseline skin condition
- Sun exposure and pollution
- Stress, sleep and diet, including protein intake
- Smoking or alcohol
- Consistency of daily use
Hormonal changes around perimenopause also affect how skin responds to any routine.
How to Maximise Results From RADIA
- Take 2 capsules daily after a meal
- Avoid skipping days
- Stay hydrated and eat enough protein
- Use sunscreen daily, as sun exposure is a major cause of collagen breakdown
RADIA contains fish-derived collagen and is not vegetarian; avoid it if you have a fish allergy. Its CoQ10 can interact with warfarin and insulin, and black pepper extract can change how some medicines are processed. Speak to a doctor first if you take medication, or are pregnant or breastfeeding.
Final Takeaway
Supplements like RADIA are not designed for instant cosmetic effects. Allow 8–12 weeks of consistent use before judging, and keep expectations realistic: the evidence for collagen supplements is mixed, and RADIA's collagen dose is lower than in most trials. Sun protection, sleep, a balanced diet and not smoking remain the most reliable ways to support healthy ageing skin.
That's the difference between honest, science-led skin nutrition and trend-driven beauty promises.
References
- Myung SK, Park Y. Effects of collagen supplements on skin aging: a systematic review and meta-analysis of randomized controlled trials. Am J Med. 2025. doi:10.1016/j.amjmed.2025.04.034
- Proksch E, Segger D, Degwert J, et al. Oral supplementation of specific collagen peptides has beneficial effects on human skin physiology: a double-blind, placebo-controlled study. Skin Pharmacol Physiol. 2014;27(1):47–55. doi:10.1159/000351376
This article is for general education and is not medical advice. Food supplements are not intended to diagnose, treat, cure or prevent any disease. Consult a qualified healthcare professional before starting any supplement, particularly if you are pregnant, breastfeeding, have a medical condition or take medication.
