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There is no good evidence for a best time to take collagen. We found no study that compared morning with evening use, or taking collagen with food versus on an empty stomach, and even Vital Proteins, one of the largest collagen brands, says there isn’t a perfect time. What studies do share is daily use over weeks or months, so a time you will remember matters more than the clock. The few studies that did control timing tied collagen or gelatin to exercise, and they measured blood markers or muscle outcomes in small groups, not skin or joints.
Peptide Labs sells Vital Proteins Collagen Peptides, and we refer to its label below. This article is general information, not medical advice. For what collagen peptides are and how they are made, see hydrolyzed collagen explained.
Key Takeaways
- No study has shown that morning, evening or empty-stomach use changes results.
- Studies used collagen daily for weeks to months, so consistency is the common factor.
- Exercise-timing studies were small and measured blood markers or muscle, not skin.
- Collagen lacks tryptophan, so it is an incomplete protein and not a substitute for whey.
- Skin benefits disappear in independent, high-quality trials; joint trials carry a high risk of bias.
Is there a best time to take collagen?
Not according to the research available. Collagen is digested like other proteins: Harvard’s Nutrition Source notes that it is broken down into amino acids that the body uses where it needs them, and some small collagen peptides also reach the blood. Studies that track collagen peptides in the blood asked volunteers to fast first so that the measurement was clean, and peptide levels peaked one to two hours later. That fasting step was part of the test method, not evidence that an empty stomach works better.
In a 2005 Japanese study, for example, volunteers who had fasted for 12 hours drank gelatin hydrolysates made from pig skin, chicken feet or cartilage. The main collagen peptide in their blood, called Pro-Hyp, peaked after one to two hours and fell to about half that level by four hours. The study measured absorption only; it did not compare meal timing or look at any outcome.
Timing advice online usually falls into three camps: morning with coffee, before or after exercise, or at night. Vital Proteins’ own April 2026 article says the right time depends on your lifestyle and stresses daily consistency, without citing a timing study. Trials of collagen for skin or joints gave it daily over weeks or months and did not compare times of day.
What the exercise-timing studies tested
Two studies are often quoted as proof that timing matters. Read closely, they tested narrow questions.
| Study | Who | What was timed | What was measured | Limits |
|---|---|---|---|---|
| Shaw et al., 2017, American Journal of Clinical Nutrition | 8 healthy young men | Vitamin C-enriched gelatin 1 hour before 6 minutes of rope skipping | Blood marker of collagen production doubled with the larger gelatin amount | Gelatin, not collagen peptides; tiny group; 3 days; blood marker only |
| Zdzieblik et al., 2015, British Journal of Nutrition | 53 men, average age 72, with low muscle mass | Collagen peptides after 12 weeks of resistance training sessions | Larger gains in lean mass and leg strength than placebo | No comparison with other timings or with whey; co-author from a collagen research company |
The Shaw study found that amino acids from gelatin peaked in the blood about an hour after the drink, which is why the authors timed it before exercise. Serum taken from the volunteers after gelatin also increased collagen in lab-grown ligament tissue. The study did not test whether taking gelatin at a different time would have worked equally well. The Zdzieblik study compared collagen with a placebo after training, not with collagen at another time of day.
Should you take collagen at night?
Evening use is sometimes linked to glycine, an amino acid that makes up about a third of collagen. Researchers from Ajinomoto, a glycine manufacturer, reported that purified glycine before bed improved self-rated sleep quality in people with insomniac tendencies. Those studies used isolated glycine, not collagen, and we found no trials testing collagen itself for sleep.
Collagen vs protein powder
Collagen peptides and whey protein are both protein powders, but they are not interchangeable. Collagen lacks tryptophan, one of the nine essential amino acids, so it is classed as an incomplete protein under PDCAAS, the scoring system FDA labeling uses. That is why the Vital Proteins label lists 18 grams of protein per serving at 0% Daily Value: the regulation calculates %DV from protein corrected for quality, and the label itself states that collagen peptides are an incomplete protein. Whey contains all nine essential amino acids and is relatively high in leucine.
A 2020 McMaster University trial in 22 healthy older women compared the two directly. Whey raised muscle protein synthesis with and without exercise; collagen raised it only briefly in the exercised leg, and over 6 days did not lift it above baseline.
| Collagen peptides | Whey protein | |
|---|---|---|
| Essential amino acids | Lacks tryptophan (incomplete) | All nine (complete) |
| %DV for protein on label | Can show 0% because of PDCAAS correction | Usually shown in full |
| Muscle protein synthesis in older women (2020 trial) | Small, short-lived rise in the exercised leg only | Increased at rest and with exercise |
| Common allergens | Depends on source (fish in marine products) | Milk |
Does collagen work? The evidence in brief
Results depend on who ran the study. A 2025 meta-analysis in the American Journal of Medicine pooled 23 randomized trials with 1,474 participants. Across all trials, collagen improved skin hydration, elasticity and wrinkles, but trials without pharmaceutical-company funding and those rated high quality showed no significant effect. The authors concluded that there is currently no clinical evidence to support collagen supplements for skin aging.
For joints, a 2023 meta-analysis of four trials in 507 people with knee osteoarthritis reported less pain with collagen peptides than placebo, but rated all four trials at high risk of bias. Harvard’s Nutrition Source notes that most, if not all, collagen research is funded or partly funded by related industries. For choosing a product, see our collagen peptides buying guide, and for sources read marine vs bovine collagen.
Practical tips and safety
- Pick a time you can keep, such as your morning coffee or a post-workout shake; unflavored collagen peptides dissolve in hot and cold liquids, according to the Vital Proteins label.
- Count collagen toward total protein, but do not rely on it as your main protein source.
- Check the source for allergies and diet: bovine, porcine, fish or chicken.
- Follow the label, and ask a healthcare provider first if you are pregnant or nursing, have a medical condition or have been told to limit protein.
Frequently Asked Questions
When should I take collagen?
No study shows that one time of day works better. Choose a time you can keep every day, because the studies that found effects used collagen consistently for weeks or months.
Should I take collagen in the morning or at night?
Either. No trial has compared the two. Claims about night use rely on studies of purified glycine, not collagen.
Should collagen be taken on an empty stomach?
There is no evidence that it matters. Absorption studies had volunteers fast only to make blood measurements cleaner.
Can I take collagen before or after a workout?
Yes, if that suits your routine. Small studies timed gelatin before exercise or collagen after training, but none compared those times with others.
Is collagen better than protein powder?
They do different jobs. Collagen is an incomplete protein, and in a 2020 trial whey raised muscle protein synthesis in older women while collagen did not.
Does collagen actually work?
The evidence is mixed. Pooled skin trials look positive, but independent and high-quality trials show no significant effect, and joint trials have a high risk of bias.
Questions about the product? Contact us. Follow the label and ask a healthcare provider before starting any supplement. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Last reviewed September 2026.
Related guides: Marine Collagen vs Bovine Collagen: Collagen Types, Sources and Safety, Collagen Peptides Buying Guide: Types, Sources and How to Compare Products, Hydrolyzed Collagen: What It Is, How It Is Made and How It Differs From Gelatin, Collagen Side Effects: Is Collagen Safe? Weight, Biotin and Allergies, Collagen Peptides Benefits: What Skin, Joint, Bone and Muscle Studies Show.