Peak Sun

Tan with less sun.

$299 AUD · $9.97/day · 30-day supply

Lyophilised powder vial · Subcutaneous injection · Self-administered

30-day full refund if you don't notice a difference. No return required.

50%
Less UV needed for equivalent tanning
Dorr et al. · Arch Dermatol
Australian Compounded
4.9 · 847 Reviews
30-Day Guarantee
Express Delivery AU-Wide

Mechanism

How Works.

Tanning requires two things: UV exposure and melanin production. MT-II amplifies the melanin side of that equation — so less UV is required to achieve more colour.

Step 01

MC1R activation

 

binds the melanocortin-1 receptor on melanocytes, activating cAMP signalling and tyrosinase — the melanin-making enzyme.

Step 02

Eumelanin shift

 

Production shifts toward eumelanin, the photoprotective brown-black pigment, rather than the red-yellow form.

Step 03

Less UV

 

With melanin primed, less UV exposure is needed to reach a visible tan.

Clinical Data

The Research.

These are 's published Phase I findings — the compound in Peak Sun.

Dorr et al. · Archives of Dermatology 2004

Across Phase 1 trials, subjects needed ~50% less UV for equivalent tanning, with fewer UV-induced sunburn cells.

PMID 15262693 ( I; shared MC1R mechanism).

Dorr et al. · Life Sciences 1996

The original Phase 1 pilot of itself demonstrated tanning across multiple body sites.

PMID 8637402 — the only human data for MT-II specifically.

Protocol

The Schedule.

MT-II is used in a loading phase to prime melanocytes, then at lower maintenance dose during UV exposure. Always combine with minimal UV — MT-II amplifies, it doesn't replace.

Phase Duration Dose UV Exposure
Loading Days 1–7 0.5–1mg daily (or every other day) 10–15 min moderate sun — enough to activate the primed melanocytes
Active tanning Weeks 2–4 0.5–1mg before UV exposure 15–20 min — you'll notice accelerated pigmentation development
Maintenance Ongoing 0.5mg 2–3x per week Minimal — colour is maintained at maintenance dose
Off-cycle Weeks at lower dose Pigmentation fades over 4–8 weeks after cessation — natural and gradual

Always use SPF during UV exposure even with MT-II — the amplified melanin provides some additional natural protection, but MT-II does not replace sunscreen. Start at the lowest effective dose. Not medical advice. Consult a healthcare professional before use.

Customer Results

They Ran It.

10,347 Australians
4.9★ · 847 reviews
1-in-3 re-order within 60 days
★★★★★
I'm Scottish-Irish. I've never tanned in my life — I burn, peel, repeat. Two weeks of Sun and 15 minutes a day in the backyard and I have colour I've never had. Not orange. Not fake. Actual tan. I genuinely didn't think this was possible for my skin type.
Connor M. — Melbourne, 31, teacher — Sun ()
★★★★★
I was sceptical — I've tried every self-tan product and nothing looks real. This is different. It's the actual pigment in my skin, not a coating on top of it. People keep asking if I just came back from a holiday. I live in Melbourne. It's winter.
Emma T. — Melbourne, 28, marketing — Sun ()
★★★★★
Running Sun for three months. The nausea in the first week was real but manageable — gone by day 5. After that, smooth sailing. I'm darker than I've ever been with a fraction of the sun exposure I'd normally need. It does what it says.
Josh K. — Brisbane, 36, construction — Sun ()

FAQ

Common Questions.

Yes — but significantly less. MT-II primes your melanocytes to produce more melanin per UV photon. You still need some UV to activate the tanning response — but the amount required is a fraction of what you'd normally need. Most users achieve their target pigmentation with 10–20 minutes of natural sunlight per day during the loading phase, where previously they would have needed hours.
The University of Arizona Phase I trial specifically included fair-skinned participants (Fitzpatrick types I and II) — individuals who normally burn without tanning. The results showed successful melanogenesis in these skin types, shifting their pigmentation response. Eumelanin (the type MT-II produces) provides natural UV protection — so the tanning response is also a protective response. Fair-skinned users should start at the lowest dose and introduce UV gradually.
Yes — this is documented in the original Arizona trials. activates five melanocortin receptors, including MC4R, which is the arousal pathway. This is how ( — Peak Libido) was discovered: researchers noticed spontaneous arousal in tanning study subjects and isolated the MC4R activity. MT-II retains this effect at standard doses. was specifically engineered to isolate the MC4R effect without the tanning effect. This is neither a side effect nor a marketing claim — it's a documented secondary mechanism of the compound.
The most commonly reported side effect is nausea, particularly in the first 1–2 weeks at loading dose. This is the most consistent finding across the published research and user experience — it is dose-dependent and typically resolves without intervention as the body adapts. Taking the dose before sleep reduces the subjective impact significantly. Facial flushing is also common. Darkening of existing moles or freckles can occur — monitor these and consult a dermatologist if any change appears irregular.
30-day full refund, no return required. The tanning effect is typically visible within 2–3 weeks of loading + minimal UV — you will either notice it or you won't. If you complete the loading phase with appropriate UV exposure and notice no difference in pigmentation within 30 days, we return your $299.
Ships as lyophilised powder in a sterile vial. Reconstitute with bacteriostatic water using a fresh syringe and needle. Administer via subcutaneous injection — the lower abdomen or flank is the most common site. Rotate injection sites session to session. Ships stable at ambient temperature; refrigerate on arrival and use reconstituted solution within 21–28 days.
Standard workplace and roadside drug screens test for recreational substances and common medications — peptides will not appear on these screens. If you compete in a WADA-sanctioned sport, verify the current prohibited list at wada-ama.org before use, as regulations update annually. We recommend confirming with your sport's governing body before any sanctioned competition.