Honest answers.

Most users notice early changes — particularly in skin hydration and joint comfort — within the first 4-6 weeks. The deeper effects on skin elasticity, hair texture, and nail strength typically express around the 8-12 week mark, which is why we recommend a 12-week course as the default.

Multi-source hydrolysed collagen peptides — types I, II, III, and X. Type I is dominant in skin and bone; type II in cartilage; type III in skin and connective tissue; type X in growth-plate cartilage. The combination addresses the full range of collagen-relevant tissues rather than focusing narrowly on one.

Both. Marine collagen (from fish skin) is rich in type I and is well-studied for skin endpoints. Bovine collagen is rich in types I, II, and III and supports a broader range of tissues. The combination delivers a complete amino acid profile.

No. Collagen by definition is an animal-derived protein — there's no plant source. We use marine and bovine sources from suppliers with traceable sourcing. We don't currently offer a vegan version because plant proteins don't deliver the same hydroxyproline content that makes collagen specifically effective for skin and joint endpoints.

Generally no — collagen, hyaluronic acid, biotin, vitamin C, and zinc are well-tolerated alongside most other supplements. If you're taking high-dose biotin separately or zinc above 25mg/day separately, watch your cumulative intake.

High-dose biotin (>5mg/day) can interfere with certain laboratory tests, particularly thyroid function tests and some cardiac markers. Our 2.5mg dose is unlikely to produce significant interference, but if you're scheduled for blood work, mention it to your doctor and consider stopping 24-48 hours beforehand.

One capsule per day, taken with water. Most people take it in the morning. Consistency matters more than perfect timing — the cumulative effects require daily use over weeks.

No. Collagen peptides at this dose contribute roughly 8 calories per capsule. The amino acids are used for tissue building, not stored as fat.

Yes. The collagen-loss patterns differ slightly between sexes (women lose collagen faster after menopause; men lose more gradually), but the underlying biology and the formula's mechanism are equally applicable. Both men and women report benefits.

There's no requirement to cycle. Continuous daily use maintains the cumulative effects; stopping for more than 4-6 weeks generally allows skin and joint effects to gradually fade. Most users continue indefinitely once they've established a daily rhythm.

60 days from delivery. If RenuYou isn't working for you, email [email protected] — we'll refund you in full, bottle returned or not.

In a GMP-certified facility in the United States. Each batch is third-party tested for amino acid profile, heavy metals, and microbial purity. The COA is available on request.