I’ve taken 15g of hydrolyzed collagen peptides every day for 8 years. I have zero joint issues, my skin is free of any lines or wrinkles, my hair grows so quickly, my skin heals fast, and old injuries are gone.
I’ve been drinking bone broth and taking collagen daily for 2 years with no visible changes to my skin.
NothingOral · 2 years
with bone broth daily
Users report
A soft but loyal benefit, mostly for joint pain and nail strength rather than skin: many say 'no difference in my skin, but my knees and nails'. A common pattern is 'I only noticed when I stopped'. Roughly a quarter to a third report nothing after months or even 1.5 years across brands. Bloating is the most frequent downside, and there is a small but recurring cluster of low mood, agitation, anxiety or headaches that clears days after stopping.
Best effects
Faster nail and hair growth · skin hydration/elasticity · less joint ache · sleep (glycine) for some
Downsides
Gas/bloating · cost per gram vs plain protein · incomplete protein (no tryptophan)
Evidence
Human RCTs — Many small, industry-funded; a 2025 meta-analysis found no skin effect when restricted to high-quality, non-industry trials
Typical use
10-15 g/day, often with vitamin C; effects judged after 8-12 weeks.
Getting it
Food-grade powder or capsules everywhere; plain gelatin is the cheap equivalent.
Stacked with
Vitamin C: taken alongside by most users and in several trial formulas, for collagen synthesis. · glucosamine, chondroitin or MSM: the usual joint stack; users often can't say which part helps. · hyaluronic acid: added in many 'beauty' collagen blends for skin hydration.
I’ve taken 15g of hydrolyzed collagen peptides every day for 8 years. I have zero joint issues, my skin is free of any lines or wrinkles, my hair grows so quickly, my skin heals fast, and old injuries are gone.
I have Ehlers danlos and bovine collagen honestly fixed my knee. It was starting to bother me so much I couldn't sleep at night and my phys told me to try this.
GlowingRecovery · 30 g with vitamin C an hour before training · Oral · 6+ months
I started taking collagen peptide powder a few weeks ago: My skin has cleared up, I can eat anything I want now, without any gut issues, My hair had gotten longer, and I feel less tired and more active
i understand the science is shaky (collagen you ingest =/= collagen your body produces) however ever since i started taking collagen daily my skin is noticeably better and my nails/hair are stronger
So it took 3 months before I finally feel like my elbow is back to 90+%. The first 2 months were tough. The past month I've been taking collagen peptides, and it has helped A LOT!
I've got a knee that, for years, used to give me extreme pain ~15-20 times a day, and now it only does it ~3 times a day after adding collagen. It took 6 weeks for this change to occur though.
It has made my hair and nails grow much more quickly. My nails are also thicker but in a stronger, healthier way. I know this for sure as I went on a month long vacation and did not take my collagen with me.
I have been using hydrolyzed collagen since my mid 20s, when I began noticing that dancing ballet was beating me to a pulp. 😂 I haven't noticed changes to my hair, but for skin and joints, definitely.
PositiveRecovery · Oral · since her mid-20s
ballet dancer; also takes chondroitin and glucosamine
I also use collagen for knee pain (same brand actually) and have found that it pretty much eliminates any knee issues I had. Could be placebo (I'm skeptical of the science behind it) but it works for me, so YMMV.
PositiveRecovery · Oral
knee overuse from sports; skeptical of the science
Been drinking collagen for about 8 months now and yeah I actually did notice something. Not like overnight magic or anything but my skin definitely feels more... bouncy?
Positivepowder in coffee · Oral · 8 months (3-4 before noticing)
I put collagen powder in my morning coffee for about 6 months and when it ran out I didn’t repurchase and noticed…nothing. I don’t think it did a single thing
I thought my digestive issues were being caused by the plain Greek yogurt I was having for breakfast every morning. ... Then one day I tried the yogurt WITHOUT the collagen powder I had been mixing with it. No problems.
If you have histamine intolerance, it could be due to the gelatin that the pills are made from. I stopped taking the dao pills and my collagen peptides pills due to histamine.
NegativeOral
histamine intolerance; collagen peptide pills, blames the gelatin capsules
I can't use collagen as it causes digestive upset, but can use beef gelatin. I add it to my hot drinks, soups etc and it has taken away my joint pain and has helped my gut issues.
NegativeGut · Oral
switched to beef gelatin, which helped her joints and gut
One of my favourite supplements, collagen peptides, eventually gave me heart palpitations after many, many tubs of it. (Went away after I stopped taking it)
My skin looks the best it has looked my whole life and generally i have 0 aches or pains, but holy shit do i feel dissociated as fuck. Also i develop zits/hives an hour after taking it
I did a strict 3 months, 10g collagen peptides daily. noticed better nail strength pretty quickly, like 3-4 weeks. skin hydration was better by month 2 but honestly its subtle.
Each bead is one amino acid in the peptide's chain, coloured by its side chain: grey for non-polar, cyan for polar, blue for positively charged and fuchsia for negatively charged. Length and mix tell related peptides apart at a glance, from a two-residue dipeptide like carnosine to a 43-residue protein like thymosin beta-4. The colours describe chemistry only and predict neither effect nor safety.
non-polarpolarpositivenegative
Report grades
Every first-hand Reddit or X report is graded on its own, from glowing through positive, mixed, nothing and negative to bad reaction, and the bar shows how those grades split. Posts that look vendor-adjacent stay on the peptide's page but are left out of the counts.
GlowingPositiveMixedNothingNegativeBad reaction
% positive
The share of a peptide's graded Reddit and X reports that are glowing or positive, vendor-adjacent posts left out. A peptide with few reports is pulled toward the average of all reports, as if it had eight average ones besides its own, so two glowing posts cannot top the list. Kept peptides rank by the same reports' mean grade, shrunk the same way, and excluded ones follow in that order.
Researcher estimate
No first-hand report of this peptide has been graded yet, so the figure is the researchers' own rating out of 10 from what they read about it. It ranks alongside the computed scores until reports arrive.
Safety tier
Each peptide is tiered clean, caution or excluded from its five risk axes under the chosen safety bar. An excluded peptide has a plausible route to serious harm, so it stays listed with the reason but ranks behind every other entry, however good its reviews.
Safety bar
The safety bar sets how much risk it takes to exclude a peptide. Strict: out on any serious mechanism with little human data, or any documented serious harm. Balanced: out on documented serious harm (unless it is obvious, reversible and from a regulated product), or a serious mechanism whose harm would be silent with no human data at all. Evidence only: out only on documented serious harm in humans that is lasting, delayed or from grey-market product.
Seen harm
Documented serious adverse events in humans, from 0 for none despite real exposure to 3 for deaths or several well-documented serious harms. Serious means a hospital or emergency visit or harm lasting weeks, so a headache or a bad night does not count.
Mechanism
A plausible biological route to serious harm at the doses people use, such as growth-factor signalling, hormone-axis suppression, heart or blood-pressure effects or immune activation. It runs from 0 when none is known to 3 when a dangerous pathway has been shown in living animals.
Data gap
How little human safety data exists for the molecule actually sold, from 0 for an approved drug with large trials and years of use to 3 for no human safety data at all. A modified analogue does not inherit its parent's trials.
Silent harm
Whether the feared harm would show quickly or stay hidden, from 0 when it is obvious and goes on stopping to 3 when it is silent and delayed, like tumour promotion or slow organ damage. User reports cannot reveal a harm that takes years to appear, so a high score here limits what good reviews can tell you.
Product
The risk of what people actually buy, from 0 for a regulated pharmacy or supplement product taken by mouth or on the skin to 3 for a grey-market injectable. In one dataset of 6,441 grey-market samples, 42–71% failed basic quality criteria and 15% carried endotoxin.
Evidence
The strongest kind of study behind the peptide's effects, from an approved drug through human controlled trials and small human studies to animal work or nothing of its own. Animal results often fail to carry over to people.
Access
How people get it: as an approved drug, a compounded prescription, an over-the-counter supplement or from the grey market, where nobody checks the vial. The channel decides both the legal position and the risk of a bad batch.
Price per month
Thirty days of the typical dose, from its low end to its high end, priced at the listing a careful buyer would choose: in stock, from a shop scoring 4 of 5 on trust (third-party tested where no score is set), failing that 3, a pure pack before a blend, a European shop first, then the cheapest per mg. The range is the dose's, not the shops'. A per-dose amount counts once a day unless the dose says otherwise. Prices are in euros at ECB rates of 2026-10-29, before shipping; the shop table keeps each listing's price per mg, per gram for bulk supplements. Where no listing can be priced the researchers' own estimate stands in, and says so.
Dose users report
The middle half of the daily doses stated in at least five first-hand reports, vendor posts left out. Where its middle sits more than twice above or below the declared dose, the month is priced at it as well, since what people take is what they pay for.
Testing
Whether the shop publishes lab results: third-party tested means an independent lab checks each batch, own COA means the shop's own certificate of analysis, and no public tests means neither. A certificate shows purity, not safety.
Added peptide
Some packs sold under one peptide's name hold a second one, such as 5 mg GHK-Cu in a nasal kit, stated only in the description. Sprayed in the nose or injected it reaches the blood like an injection, so it carries the risk of that route and is tiered as the injectable form, whatever its tier on the skin. A pack whose page gives no contents list may hold more than its name.