A 50-year-old shopper has reported that his joint pain stopped after taking California Gold Nutrition's CollagenUP powder, which is currently available for around 31p per serving with a discount code.
The unflavoured powder, which can be stirred into beverages, is on sale for £28.71, reduced from £35.89, for a 464g tub containing 93 servings. The discount code OCT26HB from iHerb brings the price down.
Supplement details and formulation
CollagenUP blends hydrolysed marine collagen peptides with hyaluronic acid and vitamin C. The collagen comes from fish and is broken down into smaller peptides through hydrolysis. It features type I and type III collagen, which occur naturally in skin, bones, tendons and ligaments, while type II collagen is linked to cartilage.
Hyaluronic acid exists naturally in connective tissue, including the fluid that enables joints to move smoothly. Vitamin C supports normal collagen formation for healthy bones and cartilage, as well as skin and blood vessels. The formula is free from gluten, soya and GMOs, and comes in a resealable pouch.
Scientific evidence on collagen
A 2026 umbrella review published in Aesthetic Surgery Journal Open Forum analysed 16 systematic reviews covering 113 randomised controlled trials and 7,983 participants. Scientists found positive outcomes linked to collagen supplementation across skin and musculoskeletal health, though the quality of evidence differed between outcomes.
A meta-analysis published in International Orthopaedics revealed that collagen supplementation was linked to improvements in osteoarthritis symptoms, including pain relief, compared with a placebo. A separate 2016 clinical trial documented improvements in knee pain, stiffness and physical function among participants taking undenatured type II collagen over six months.
It is important to note that collagen is a food supplement, not medicine, and does not cure arthritis. Other elements, such as duration of use and collagen variety, can influence outcomes.
Customer reviews and alternatives
One buyer commented: "Noticeable difference in how my knees feel during and after my daily walks. I used to feel that dull ache and stiffness after walking for more than 20 to 30 minutes, especially on inclines. Since adding a scoop of this to my tea every morning, the stiffness has significantly backed off, and my joints feel cushioned rather than dry and crunchy."
Another added: "I recommend it; I bought it for joint support. I'm 50 years old, I go to the gym regularly, and lately my knee has been hurting after heavy sets. My brother recommended this CollagenUP. I've been taking it every morning on an empty stomach for six months now. The results are real: my joint pain has stopped, and my knees feel great when doing squats. It dissolves easily, has almost no taste, and smells like seaweed. The product is high-quality, and it's 100% worth the money. I'll be taking another course."
Some customers noted a fishy aftertaste and recommended mixing it with other drinks. A subscribe and save deal on the California Gold CollagenUP is available for £30.51, reduced from £35.89, on iHerb's website. Other alternatives include Vida Glow Pro Collagen+ Powder (20g) for £55 from LookFantastic, and Vital Proteins Collagen Peptides Powder Supplement for £39.93, reduced from £51.75, on Amazon.
