When Is the Best Time to Take Collagen After 40?

When Is the Best Time to Take Collagen After 40?

Take it first thing, on an empty stomach. Take it before bed, because that is when your body repairs itself. Take it with vitamin C or it will not work. Take it 30 to 60 minutes before you train.

Four rules, four confident sources, and they cannot all be load-bearing. One of them traces to a real piece of research. The others trace to somebody repeating a plausible idea until it hardened into a protocol.

This article covers where each rule came from, which questions have been tested in humans and which have never been tested at all, whether your goal changes the answer, and what turns out to matter a great deal more than the hour on the clock.

The timing rule What the research shows
Take it in the morning Never tested. No trial has compared morning against evening collagen intake in humans
Take it at night Also never tested. Collagen breakdown does follow a daily rhythm, peaking around 5 a.m., but no trial has used that to time a supplement
Take it on an empty stomach Never tested against taking it with food. Absorption studies are run fasted for measurement reasons, not because fasted works better
Take it 30 to 60 minutes before exercise Traces to one crossover study in 8 men. A repeat attempt in 10 men found a 20% rise that missed statistical significance
It must be taken with vitamin C Vitamin C is genuinely required for collagen assembly, but it was given to every group including placebo in the main trials, so its separate contribution has never been isolated
Do not take it with other protein The opposite. Adding 5 g of collagen to 25 g of whey prevented a fall in blood glycine that whey alone produced
Take it consistently The one rule with real support. Every trial that changed tendon or skin ran for 8 weeks or longer at 15 g a day or more

 

Why collagen timing became so confusing

Collagen research has a structural problem that produces confident advice out of thin evidence.

Connective tissue changes slowly. Measuring whether a tendon got thicker or skin got firmer takes months, costs a great deal, and needs imaging. Measuring a blood marker takes an afternoon. So most collagen studies measure a marker called PINP, a fragment released when the body assembles new type I collagen, and they measure it over a few hours.

Short studies with blood markers are how timing questions get answered, because timing only makes sense as a question if the window you are measuring is small. Nobody designs a 12-month trial to test whether 7 a.m. beats 9 p.m.

The result is a literature where the acute studies are numerous and the long studies are few, and the advice you read online was built almost entirely from the acute ones.

There is a second problem, and for this audience it is the larger one. A 2026 systematic review pooled every randomized trial of collagen supplementation and tendon outcomes it could find. Eight trials met the standard, covering 257 people aged 18 to 52. Of those 257, 246 were men and 11 were women (Buchalski et al., 2026).

Eleven women. That is the evidence base underneath advice aimed at a market that is overwhelmingly female.

Morning or night: is there a winner?

No. And the reason is simpler than either camp admits: the study has not been done.

No published trial has randomized people to take collagen in the morning or the evening and compared what happened. Every recommendation you have read on this is inference, not measurement.

What does exist is a real daily rhythm in collagen turnover, and it is worth knowing because it explains why the night argument sounds convincing.

Researchers sampled blood every three hours over 27 hours in 100 people, measuring CTx, a fragment released when existing type I collagen is broken down. Levels peaked around 5 a.m. and bottomed out around 2 p.m., swinging roughly 40% either side of the daily average. The rhythm held steady through five days of bed rest, in people with no normal cortisol rhythm, and in blind participants with no light cycle. It was also similar in premenopausal women and in early and late postmenopausal women (Qvist et al., 2002).

So your connective tissue does run on a clock, and menopause does not appear to switch that clock off. From there it is a short step to "take collagen at night, when the remodeling happens."

It is a reasonable hypothesis. It is not a finding. Knowing that tissue breakdown peaks before dawn tells you nothing about whether amino acids swallowed at 9 p.m. reach that tissue more usefully than amino acids swallowed at 8 a.m. Collagen peptides take one to two hours to peak in the blood and the amino acid pool they join is not emptied overnight.

If someone tells you night is better, ask which trial. There is not one.

Does fasting improve collagen absorption?

This one has a specific and slightly embarrassing origin.

Every human absorption study of collagen peptides is run in fasted participants. You will find it in the methods of all of them. That is not because fasting works better. It is because a pharmacokinetic study needs a clean baseline, and food in the stomach adds variables that wreck the measurement.

Somewhere between the methods section and the internet, a measurement convention turned into a dosing instruction.

No trial has compared collagen taken fasted against the same collagen taken with a meal and measured what happened to the tissue. The absorption question has not been answered either way.

What we do know argues against fasting mattering much. Collagen peptides are absorbed efficiently, and a meaningful fraction arrive in the blood as intact di- and tripeptides carried by dedicated transporters rather than as loose amino acids. Those transport systems are not easily overwhelmed by a slice of toast.

There is one genuinely odd finding in this area worth mentioning, because it points the other way. In the 100-person study above, fasting was the only variable that changed the daily collagen rhythm, and it flattened it, cutting the swing to roughly a quarter of its normal size. Whether that matters for anything you care about is unknown. It is a reminder that fasting is not a neutral state.

Why researchers study collagen around exercise

Here the biology is genuinely interesting, and it is the one area where a timing argument has a mechanism behind it.

Tendon and ligament have poor blood supply. They are also mechanically responsive: load them, and the cells inside them increase collagen production for a period afterward. That creates a plausible window. If the raw materials are circulating while the tissue is switched on, perhaps more gets built.

That reasoning is why the research exists. It is a good reason to run the study. It is not the same as the study having worked.

The most relevant trial for anyone over 40 tested eight resistance-trained men, average age 49, in a double-blind crossover. Each man performed the same lower-body session three separate times after consuming 0 g, 15 g or 30 g of hydrolyzed collagen. Collagen synthesis, measured as PINP over the following hours, rose with dose: 30 g beat 15 g, and both beat nothing (Nulty et al., 2024).

The striking result was the control condition. Resistance exercise with no collagen produced no change in PINP at all. In young men, training alone raises it. In these middle-aged men it did not, which the authors describe as connective tissue anabolic resistance, and 15 g was enough to restore the response.

That is the strongest argument in this entire article for a woman over 40 taking collagen alongside training, and it comes with three caveats that belong in the same breath. Eight participants. All men. And a blood marker measured over hours, not a tendon measured over months.

Where the 30 to 60 minute rule came from

Trace the advice back and it ends at a single study.

In 2017, researchers gave eight healthy men either 5 g or 15 g of vitamin C-enriched gelatin, or a placebo, one hour before six minutes of rope skipping, three times a day for three days. Blood amino acids peaked one hour after the drink. The men who took 15 g an hour before exercise showed roughly double the PINP of the placebo condition (Shaw et al., 2017).

Eight men. Rope skipping. A three-day protocol. That is the foundation of a rule now printed on tubs worldwide.

Two things happened next that rarely travel with the headline.

The editorial. The same issue of the same journal carried a commentary on that study, written by researchers at the National Institutes of Health. Their observation was blunt: the PINP measurements are indicative of bone turnover rather than of new collagen synthesis in cartilage and tendons, and whether the increase has clinical benefit should be a subject of future work (Levine and Violet, 2017). The marker underneath the pre-exercise rule may not be reporting on the tissue the rule is sold for.

The repeat. Two years later the same laboratory ran the protocol again in 10 recreationally active men, comparing vitamin C-enriched gelatin, hydrolyzed collagen, a gelatin gummy and placebo, all taken one hour before jump rope. PINP tended to rise about 20% in the gelatin and hydrolyzed collagen conditions. But the variability between individuals was large enough that, in the authors' own words, it precluded significance for any treatment (Lis and Baar, 2019).

A repeat attempt that misses significance does not mean the first result was wrong. It means the effect is smaller or noisier than a rule stated to the minute would imply.

Now the finding that should settle how seriously you take the clock. Twenty recreationally active men, average age 47, trained twice a week for 12 weeks. Half received 30 g of collagen with 50 mg of vitamin C, half received matched maltodextrin with the same vitamin C, both taken after the training session. Patellar tendon cross-sectional area increased more in the collagen group (p = 0.027), as did tendon stiffness (p = 0.009) and Young's modulus (p = 0.018). Strength and muscle thickness improved in both groups with no difference between them (Nulty et al., 2025).

The longest trial in middle-aged people, the one that measured actual tendon structure rather than a blood marker, dosed after exercise and found tendon change anyway.

Nobody has run the head-to-head. No trial has randomized people to before against after and compared them. Anyone stating that one is superior is stating a preference.

Vitamin C: necessary biology, untested addition

Two different questions get answered as one here, and separating them is the whole point.

Is vitamin C required to build collagen? Yes, without qualification. The enzymes that hydroxylate proline and lysine residues depend on it. Those modifications are what let three collagen strands wind into a stable triple helix. Without vitamin C the strands cannot assemble properly, which is the biochemistry of scurvy. This is not in dispute.

The detail worth knowing is how vitamin C is used. It does not get consumed one molecule per collagen molecule. The enzyme inactivates itself periodically during normal work, and vitamin C reactivates it. It is closer to a mechanic than a raw material.

Does adding vitamin C to every collagen serving improve outcomes in someone who already eats enough? That is a completely different question, and the answer is that nobody has tested it.

Look at how the trials were built. In the middle-aged dose-response study, all three conditions used vitamin C-enriched collagen, including the 0 g condition. In the 12-week tendon trial, both the collagen group and the placebo group received 50 mg of vitamin C. In the original 2017 study, the vitamin C was dissolved in the drink given to every arm including placebo.

Vitamin C was held constant on purpose, so that the collagen dose was the only thing changing. That is good experimental design. It also means that across this entire body of work, the contribution of the vitamin C itself was never measured. The systematic review recommends 15 to 30 g of collagen with at least 50 mg of vitamin C because that is what the trials used, not because anyone compared it against collagen alone.

What follows practically is modest. Fifty milligrams of vitamin C is a small orange, or half a cup of strawberries, or a fraction of most multivitamins. If you eat fruit and vegetables you are very likely there already. A collagen product bundling vitamin C is doing something harmless and inexpensive. A collagen product charging a premium for it is charging for a variable that has never been isolated.

If your diet is genuinely low in fruit and vegetables, the vitamin C matters, and it matters for reasons well beyond collagen.

Can you take collagen with protein?

Yes, and the research here produced a result that runs directly against the common advice.

The worry is that other protein competes with collagen peptides for absorption. Fourteen men tested a version of that question: each received 30 g of protein after resistance exercise, made up of whey alone, or whey with 5 g, 10 g or 15 g of collagen substituted in. Blood amino acids were tracked for six hours (Aussieker et al., 2024).

Total amino acid availability did not differ between conditions. What did differ was glycine, the amino acid collagen is richest in and the one connective tissue needs most.

After whey alone, plasma glycine availability was negative, at minus 8.9. Adding just 5 g of collagen turned it positive at plus 9.2. Ten grams gave 23.1 and fifteen grams gave 39.8.

Read that again, because it is the opposite of the usual warning. Whey on its own caused glycine availability to fall below baseline during recovery. A small amount of collagen alongside it prevented that fall.

There is a trade-off and it should be stated. Leucine and essential amino acid availability were higher with whey alone than with the 10 g and 15 g collagen substitutions, which is expected, since collagen is a poor source of both. That is the same limitation covered in detail in collagen vs protein powder after 40, and nothing here changes it. Collagen is not a substitute for complete protein.

The practical reading: do not swap your protein for collagen, and stop worrying about taking them together. Greek yogurt, eggs, a protein shake, a high-protein meal, none of them is a reason to move your collagen to a different hour.

Does your goal change the best time?

For one goal there is an argument. For the rest there is nothing, and saying so is more useful than inventing a schedule.

Your goal Does timing have evidence behind it? What the research does support
Skin No. Skin trials dose once daily and do not specify or test an hour Daily intake for 8 to 12 weeks minimum, at a dose that has been studied
Joints No. Joint trials report a daily dose, not a time of day Consistency over weeks to months, judged inside that window
Tendons and ligaments Partly. This is the one area with a mechanism and human data, though the head-to-head has never been run 15 to 30 g on training days, taken near the session, before or after
Exercise recovery Weak. Recovery effects appear in pooled analyses but timing was not the variable tested Adequate total protein first, collagen as an addition
General connective tissue support No Whatever hour you will keep doing for six months
Muscle Not the right supplement for the goal Complete protein and resistance training, covered separately

 

On that last row, the systematic review is unusually direct. Across all eight tendon trials, muscle strength improved with training in every one, and no additive effect of collagen was observed. The authors grade that as strong evidence against an effect on strength. Which matches what the training trials show about collagen and muscle, and is the reason nobody here is going to tell you collagen builds it.

What matters more than timing

Seven things, in descending order of how much evidence sits behind them.

1. Taking it at all, on most days, for months. Every trial that produced a measurable change in tendon, skin or bone ran for at least eight weeks of daily supplementation. None of them found a shortcut. A perfectly timed scoop taken three times a week is worse than a badly timed scoop taken daily.

2. The dose. This is the variable the research keeps rewarding. In middle-aged men, 15 g restored a collagen synthesis response that exercise alone had failed to produce, and 30 g went further. In the systematic review, trials using 15 to 30 g showed between-group improvements in tendon stiffness while trials using around 5 g showed only within-group changes. How much, and why one number cannot be right for every goal, is covered in how much collagen should you take after 40.

3. Resistance training. Every tendon trial in that review required participants to be training. Not one tested collagen in someone sedentary. The supplement is the addition. The loading is the intervention.

4. Total protein. Collagen is an addition to your protein intake, not a replacement for it. A woman eating 55 g of protein a day has a bigger problem than her collagen schedule.

5. Vitamin C sufficiency, not vitamin C supplementation. Be not deficient. That is the whole requirement, and fruit and vegetables handle it.

6. Overall diet quality. Connective tissue is built from what you eat generally, not from one scoop.

7. Time. Tendon adapts over months. Skin trials run 8 to 12 weeks. Bone trials run a year. Judging a collagen powder after two weeks tells you nothing the research would recognize.

Notice what is absent from that list. The hour. It does not appear because the evidence does not put it there.

A simple routine for women over 40

This is what the evidence supports, stated as briefly as it deserves.

Take it once a day, at whatever moment you will not forget. For most women that is with morning coffee, because coffee happens every day and good intentions do not.

Take an amount that matches the research rather than the scoop. Somewhere from 10 to 20 g covers the skin evidence comfortably and approaches the connective tissue range.

If you lift, take it near your session on training days. Before or after, whichever you will remember. The 12-week trial that changed tendon structure in middle-aged people dosed afterward.

Do not build a ritual around it. No fasting window, no separating it from your protein, no alarm set for 60 minutes before the gym. Every one of those rules is either untested or rests on eight men and a skipping rope.

Give it three months before you decide anything.

  • Speak to your doctor before starting collagen if you have kidney disease or are on a protein restricted diet
  • Check with your doctor before any new supplement if you are pregnant, breastfeeding or taking prescription medication
  • Speak to your doctor if joint or tendon pain is severe, one-sided, or came on after an injury, rather than managing it with supplements
  • Ask about a bone density scan if you are postmenopausal and have not had one, particularly with a family history of fracture

Where Botavive Collagen fits

Botavive Collagen Powder provides 20 g of collagen peptides per serving, supplying 18 g of protein, with 90 mg of hyaluronic acid. It is unflavored, which is the only feature in this article that has anything to do with timing.

Unflavored matters for a practical reason rather than a scientific one. A powder that changes the taste of your coffee is a powder you stop taking in week three, and the single strongest finding in all of this is that consistency over months is what the trials measured. Something that disappears into what you already drink every morning gets taken.

On dose, 20 g sits in the range the connective tissue trials used rather than below it. That is a deliberate choice, not a claim that 20 g is optimal. Nobody has run the trial that would establish an optimum.

What this is not is a product with its own timing protocol, and you will not find one on the label. The research does not support writing one.

Frequently asked questions

What is the best time of day to take collagen?

Whichever time you will repeat. No published trial has compared morning against evening collagen intake, so any confident answer is preference rather than evidence. Collagen turnover does follow a daily rhythm, with breakdown peaking around 5 a.m. and dipping in the early afternoon, and that rhythm is similar in premenopausal and postmenopausal women. Nobody has shown that timing a supplement to it changes anything.

Should I take collagen before or after exercise?

Either, and the choice matters less than the training itself. The pre-exercise protocol comes from studies giving collagen an hour before loading, which found short-term rises in a collagen synthesis marker. The one 12-week trial in middle-aged people that measured actual tendon structure gave it after training and still found greater gains in tendon size and stiffness than placebo. No trial has compared the two head to head.

Do I need vitamin C with collagen?

You need to not be deficient in vitamin C, which is a much lower bar than taking it with every scoop. Vitamin C is genuinely required for collagen assembly, but in the trials it was given to every group including the placebo groups, so its separate contribution has never been measured. The 50 mg used in those studies is roughly one small orange. If you eat fruit and vegetables, you are covered.

Should collagen be taken on an empty stomach?

There is no evidence that it needs to be. Absorption studies are conducted in fasted participants because a clean baseline is required to measure blood concentrations accurately, not because fasting improves the result. No trial has compared fasted against fed collagen and measured an outcome. Collagen peptides are absorbed efficiently, partly as intact short peptides through dedicated transporters, and a meal does not appear to be an obstacle.

Can I put collagen in coffee?

Yes. This was tested directly: the same collagen was given dissolved in water or in coffee, and blood was tracked for six hours. The bioactive peptides that survive digestion intact showed similar uptake either way on every pharmacokinetic measure. Some free amino acid concentrations shifted over time with coffee, which is what you would expect from a drink rich in polyphenols, but the peptides came through. Hot coffee does not destroy collagen peptides; they have already been broken down by enzymes before they reach the tub.

Can I take collagen and protein powder together?

Yes, and there is a reason to. When 14 men took 30 g of protein after resistance exercise, whey alone caused blood glycine availability to fall below baseline. Adding 5 g of collagen to 25 g of whey prevented that fall, and larger collagen amounts raised it further. The trade-off is that substituting collagen for whey lowers leucine availability, so use collagen alongside your protein rather than instead of it.

How long should I take collagen before judging results?

Three months. Skin trials generally run 8 to 12 weeks, the tendon trial in middle-aged people ran 12 weeks, and bone trials run a year. Nothing in this literature produces a measurable change in a fortnight, and no dose or timing has been shown to shorten the timeline. If you are going to judge it, judge it at the interval the research uses.

Sources

  1. Shaw G, Lee-Barthel A, Ross ML, Wang B, Baar K (2017). Vitamin C-enriched gelatin supplementation before intermittent activity augments collagen synthesis. American Journal of Clinical Nutrition 105(1):136-143. PMID 27852613. doi 10.3945/ajcn.116.138594. pubmed.ncbi.nlm.nih.gov/27852613
  2. Levine M, Violet PC (2017). Breaking down, starting up: can a vitamin C-enriched gelatin supplement before exercise increase collagen synthesis? American Journal of Clinical Nutrition 105(1):5-7. PMID 28003207. doi 10.3945/ajcn.116.148312. pubmed.ncbi.nlm.nih.gov/28003207
  3. Lis DM, Baar K (2019). Effects of different vitamin C-enriched collagen derivatives on collagen synthesis. International Journal of Sport Nutrition and Exercise Metabolism 29(5):526-531. PMID 30859848. doi 10.1123/ijsnem.2018-0385. pubmed.ncbi.nlm.nih.gov/30859848
  4. Nulty CD, Tang JCY, Dutton J, Dunn R, Fraser WD, Enright K, Stewart CE, Erskine RM (2024). Hydrolyzed collagen supplementation prior to resistance exercise augments collagen synthesis in a dose-response manner in resistance-trained, middle-aged men. American Journal of Physiology: Endocrinology and Metabolism 327(5):E668-E677. PMID 39259166. doi 10.1152/ajpendo.00252.2024. pubmed.ncbi.nlm.nih.gov/39259166
  5. Nulty CD, Phelan K, Erskine RM (2025). Hydrolysed collagen supplementation enhances patellar tendon adaptations to 12 weeks' resistance training in middle-aged men. European Journal of Sport Science 25(4):e12281. PMID 40100255. doi 10.1002/ejsc.12281. pubmed.ncbi.nlm.nih.gov/40100255
  6. Buchalski A, Jeanfavre M, Altorelli C, Leff G (2026). Collagen supplementation on tendon-related structural and performance outcomes: a systematic review. Journal of Functional Morphology and Kinesiology 11(1):130. PMID 41900537. doi 10.3390/jfmk11010130. pubmed.ncbi.nlm.nih.gov/41900537
  7. Aussieker T, Janssen TAH, Hermans WJH, Holwerda AM, Senden JM, van Kranenburg JMX, Goessens JPB, Snijders T, van Loon LJC (2024). Coingestion of collagen with whey protein prevents postexercise decline in plasma glycine availability in recreationally active men. International Journal of Sport Nutrition and Exercise Metabolism 34(4):189-198. PMID 38604602. doi 10.1123/ijsnem.2023-0264. pubmed.ncbi.nlm.nih.gov/38604602
  8. Qvist P, Christgau S, Pedersen BJ, Schlemmer A, Christiansen C (2002). Circadian variation in the serum concentration of C-terminal telopeptide of type I collagen: effects of gender, age, menopausal status, posture, daylight, serum cortisol, and fasting. Bone 31(1):57-61. PMID 12110413. doi 10.1016/s8756-3282(02)00791-3. pubmed.ncbi.nlm.nih.gov/12110413

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