Medik8 Liquid Peptides Dupes & Cheaper Alternatives
From 37 Reddit threads · Updated October 2, 2026
Multi-peptide serum for plumper-looking skin; pricey and sometimes heavy. The catch: stupidly expensive for what it is. Here's what Redditors reach for instead.
The short answer
Best Overall AlternativePeptides plus copper for long-game aging support
Best Cheaper AlternativeOTC retinol step-up without prescription · $9.30 · 29.6 ml vs $68.00 for the original
#1
Best Overall Alternative
- Key actives: Copper Peptides 1%
The why
One minus
Results are glacial — plenty of people see nothing after a bottle
Both recommended for Anti-Aging; discussed alongside Medik8 Liquid Peptides in 5 threads.
“Peptides - Copper Peptides especially are a fantastic way of brightening, healing the skin barrier, boosts collagen etc.”
— Reddit, r/tretinoin
The original, at a glance
- Why people love it
- Peptide stack for firmness vibes
- Price
- $68.00 · 29.6 ml · $2.30/ml
#2
Best Cheaper Alternative
- Key actives: Retinol 0.5%
- Size: 29.6 ml
- Price per ml: $0.31/ml (original $2.30/ml)
The why
Studies found retinol can reduce acne, and Reddit says this 0.5% version also improves texture and pores. It suits people who want an OTC step-up and can tolerate a retinoid; sensitive, dry, or easily irritated skin often needs slower easing in.
One minus
Retinol burn is a real theme — plenty of sensitive-skin reports
Good forDry Skin
Both recommended for Anti-Aging.
“i started with the ordinary retinol 0.5% and worked up from there”
— Reddit, r/SkincareAddiction
#3
Same Active: Peptides
The why
A peptide-and-niacinamide fluid people use for that glossy, polished skin look. Redditors mostly slot it into minimalist routines or under makeup, but some sensitive-skin users suspect the niacinamide is the problem.
One minus
Niacinamide can be the culprit for reactive skin
#4
Best for Dehydration
- Key actives: Hyaluronic Acid 2%
- Size: 30 ml
- Price per ml: $0.62/ml (original $2.30/ml)
The why
A hyaluronic acid serum with panthenol and glycerin that people mainly use for dehydration and post-retinoid tightness. Best on damp skin under moisturizer, especially if your barrier is cranky. Dry climates and heavy layering can make it feel sticky or useless.
One minus
Sticky, tacky, and prone to pilling
Good forDry Skin, Sensitive Skin
Both recommended for Dehydration.
“I started using the ordinary hyaluronic acids serum on damp skin.”
— Reddit, r/SkincareAddiction
Other alternatives worth a look
Starter retinoid with low-irritation rep · 72 mentions
Anti-Aging
Starter-strength retinol with room to step up later · 52 mentions
Combination SkinAcne
Oil control and pore shrinkage · 576 mentions
Combination SkinDewy Finish
Watery, fast-absorbing centella · 533 mentions
Combination SkinFragrance-Free
Centella, panthenol, and ceramide NP do the barrier-support job · 195 mentions
Combination SkinFragrance-Free
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