Written by Shereen, Product Management Associate · Updated 6 November 2026
Do The Purest Co collagen drinks have side effects?
Collagen is well tolerated: a review of 11 placebo-controlled trials found no reported side effects. Our collagen drinks list every ingredient and publish independent lab reports, with no mercury detected in any of them. All contain fish, so skip them with a fish allergy, and check with your doctor first if you're pregnant, breastfeeding or on medication.
This article is for you if: you're thinking about Collagen Glow Berries, Collagen Glow Berries Zero, Collagen Glow Cremé Yogurt, Collagen Glow Strawberry Smoothie, Marine Collagen Peptides or Marine Collagen Peptides Matcha, and want to know exactly what's inside, what the research and our lab tests show, and whether they suit you.
Checking what's in a collagen drink before you buy is a smart move, especially if you're pregnant, have a food allergy or already take other supplements. Collagen is a protein, and the hydrolysed collagen in our drinks is collagen broken down into small pieces called peptides. So the useful questions are what else is in each drink, what trials found, and who should check with a doctor first. Here are the answers for each of our collagen drinks.
→ See Collagen Glow Berries, our ready-to-drink marine collagen sachet
In this article
What's inside each of our collagen drinks?
Each drink lists the full ingredients on the pack and product page, with the amount of collagen and every key ingredient per serving. Here's how they compare.
| Drink | Key ingredients per serving | Collagen source | Sugar per serving | Contains |
|---|---|---|---|---|
| Collagen Glow Berries (30 g sachet) | 6,000 mg Wellnex™ marine collagen dipeptides, 250 mg vitamin C, 100 mg bilberry extract | Hydrolysed Types I and III, from tilapia | 2 g | Fish |
| Collagen Glow Berries Zero (30 g sachet) | The same key ingredients, in the same amounts | The same as Collagen Glow Berries | 0 g | Fish |
| Collagen Glow Cremé Yogurt (30 g sachet) | The same key ingredients, in the same amounts | The same as Collagen Glow Berries | 2 g | Fish, milk |
| Collagen Glow Strawberry Smoothie (30 g sachet) | The same key ingredients, in the same amounts | The same as Collagen Glow Berries | 2 g | Fish |
| Marine Collagen Peptides (10 g scoop) | 5,000 mg marine collagen peptides, 50 mg water bamboo extract, 10 mg beta-carotene | Hydrolysed Types I and III, from wild-caught Norwegian cod | 1.8 g | Fish |
| Marine Collagen Peptides Matcha (13 g scoop) | 5,000 mg marine collagen peptides, 3,000 mg matcha, 50 mg water bamboo extract | Hydrolysed Types I and III, from wild-caught Norwegian cod | 0.7 g | Fish, milk, natural caffeine from matcha |
Sources: our product guide, product pages and product information sheets, checked 6 November 2026.
A few notes for allergies and diets:
- Collagen Glow Berries is free from dairy, gluten, soy and nuts, with no artificial colours or preservatives. It is halal-certified by the Taiwan Halal Integrity Development Association.[1]
- Collagen Glow Berries Zero has 0 g of sugar per sachet, uses monk fruit extract and sucralose for sweetness, and is free from preservatives and artificial colouring.
- Collagen Glow Cremé Yogurt is made with cultured milk, so it contains milk as well as fish.
- Collagen Glow Strawberry Smoothie tastes creamy but contains no dairy.
- Marine Collagen Peptides is free from soy, gluten and dairy, and is halal-certified by JAKIM, the Department of Islamic Development Malaysia.[1]
- Marine Collagen Peptides Matcha is also halal-certified by JAKIM, and contains milk and natural caffeine from matcha.
- Marine Collagen Peptides and Marine Collagen Peptides Matcha are made on equipment that also processes gluten, fish, milk, soy, nuts, sesame seed and sulphur dioxide.
What does research say about collagen's safety?
Collagen has a reassuring safety record in clinical trials, at amounts like the ones in our drinks.
- Hydrolysed collagen, in all six of our collagen drinks. A 2019 systematic review of 11 randomised, placebo-controlled trials, with 805 people, concluded that collagen supplementation is generally safe, with no reported adverse events. Eight of those trials gave 2.5 to 10 g of hydrolysed collagen a day for 8 to 24 weeks.[2] Our drinks give you 5,000 mg (5 g) or 6,000 mg (6 g) a day, inside that range.
- Collagen dipeptides, in Collagen Glow Berries, Collagen Glow Berries Zero, Collagen Glow Cremé Yogurt and Collagen Glow Strawberry Smoothie. In a randomised, placebo-controlled trial of a collagen rich in the dipeptides Pro-Hyp and Hyp-Gly, the researchers checked safety with blood tests and saw no adverse events. The same collagen improved facial skin moisture, elasticity, wrinkles and roughness compared with placebo.[3]
- Vitamin C, in the same four drinks. Each sachet has 250 mg, a quarter of the 1,000 mg daily maximum that Singapore's Health Sciences Authority (HSA) sets for vitamin C in health supplements for adults.[4]
For what those trials found collagen does for skin, from hydration to elasticity, see do collagen drinks actually work? Every label also gives the same simple advice: stop taking the drink if you're unwell or have an allergic reaction.
Who should check with a doctor first?
Check with your doctor before you start any of our collagen drinks if you're pregnant, breastfeeding, taking medication or have a medical condition, as every label advises. A few points are worth knowing:
- Pregnancy and breastfeeding. We recommend talking to your doctor or midwife before you take any supplement while pregnant or breastfeeding.[1] Our guide to collagen and pregnancy covers what the research shows. If mercury in fish is on your mind, mercury was not detected in the lab reports for any of our six collagen drinks.[5]
- Fish allergy. All six contain fish, because marine collagen comes from fish. Avoid them if you have a fish allergy.
- Milk. Collagen Glow Cremé Yogurt and Marine Collagen Peptides Matcha contain milk. Collagen Glow Strawberry Smoothie tastes creamy but contains no dairy.
- Caffeine. Marine Collagen Peptides Matcha contains natural caffeine from 3,000 mg of matcha, so it's best in the morning or early afternoon. The other five have no caffeine-containing ingredients.
- Children. Our collagen drinks are formulated for adults. Ask a healthcare professional before giving one to a child.[1]
- Other allergies. Read the full ingredient list on the pack, and note the shared-equipment statement on Marine Collagen Peptides and Marine Collagen Peptides Matcha.
How can you tell if a collagen supplement is safe?
Look for things you can check yourself: a full label with the collagen amount, a named collagen source, published lab tests and named manufacturing certifications. In Singapore, health supplements don't need HSA approval or a licence to be sold. HSA bans medicinal ingredients such as steroids in them, sets limits for toxic heavy metals and microbes, and the seller must make sure the product is not harmful.[4] Our guide on how to read a supplement label in Singapore explains why "HSA approved" on a supplement is a red flag, and our look at where our marine collagen comes from explains why the source matters.
| What to check | Look for | Be wary of |
|---|---|---|
| Ingredients | Every ingredient listed, with the collagen amount per serving | A "proprietary blend" with no amounts |
| Collagen source | A named source, such as tilapia or cod, and hydrolysed peptides | "Collagen" with no source stated |
| Purity | Published lab reports for heavy metals and microbes | "Pure" or "clean" labels with no test results |
| Manufacturing | Named certifications, such as HACCP or ISO 22000, from a brand you can contact | Quality logos with no details behind them |
| Claims | Studied amounts, taken daily for weeks | Promises of overnight results, or "100% safe" |
| Seller | The maker's own website and official stores, or retailers with an established presence in Singapore | Unknown sellers, or prices far below the usual |
Sources: HSA's standards for health supplements and HSA consumer advice on adulterated, counterfeit and substandard health products,[4] [6] and our guide to reading supplement labels.
HSA points out that no product is completely free of risk, so a "100% safe" claim is a warning sign rather than a reassurance.[6] Reviews from verified buyers help too, as a check alongside these rather than instead of them.
What do our lab tests show?
Every collagen drink in this guide has published reports from independent laboratories, and mercury, arsenic and cadmium were not detected in any of them.[5]
- Collagen Glow Berries: SGS, an independent testing company in Taiwan, screened it for 15 hormones, including oestrogens, progesterone and testosterone, and for 9 phthalate plasticisers. None was detected. SGS also found no arsenic, lead, cadmium or mercury, and tests for coliforms, E. coli and total bacteria came back negative.
- Collagen Glow Berries Zero, Collagen Glow Cremé Yogurt and Collagen Glow Strawberry Smoothie: an independent laboratory in Malaysia detected none of the 5 heavy metals tested (arsenic, lead, mercury, cadmium and antimony). It found no growth of bacteria, yeast, mould, E. coli or Staphylococcus aureus, and no Salmonella.
- Marine Collagen Peptides: none of the same 5 heavy metals was detected, and E. coli, Salmonella and Staphylococcus aureus were not found.
- Marine Collagen Peptides Matcha: every heavy metal result is well within HSA's limits, with arsenic, mercury, cadmium and antimony not detected, and no microbial growth or Salmonella was found.
Behind the reports, our collagen drinks are made by production partners in Taiwan and Malaysia, in US FDA-registered facilities with HACCP and ISO 22000 certification, and we run extra testing in Taiwan and Singapore to screen for commonly found medicines.[1] You can open every report on our lab tests page.
How should you take them?
Take one serving a day, at the time on the label. Our product guide has how to take and store every product.
- Collagen Glow Berries, Collagen Glow Berries Zero, Collagen Glow Cremé Yogurt and Collagen Glow Strawberry Smoothie: 1 sachet a day, before breakfast or at bedtime. Shake, tear and sip, with no water needed.
- Marine Collagen Peptides: 1 scoop (10 g) a day, stirred into 300 to 350 ml of water, before breakfast or before bed.
- Marine Collagen Peptides Matcha: 1 scoop (13 g) a day, mixed with 150 ml of water, before or after a meal, ideally in the morning or afternoon.
Make it a daily habit: most trials in the 2019 review gave collagen every day for 8 to 24 weeks.[2]
Collagen Glow Berries gives you 6,000 mg of Wellnex™ marine collagen dipeptides, 250 mg of vitamin C and 100 mg of bilberry extract in every ready-to-drink sachet. It's halal-certified, free from dairy, gluten, soy and nuts, and the lab reports are published for you to check.
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Related reading: Do collagen drinks actually work? What clinical trials show · Where our marine collagen comes from · How to read a supplement label in Singapore
Frequently asked questions
Does Collagen Glow Berries have side effects?
Collagen Glow Berries is built around 6,000 mg of Wellnex™ marine collagen dipeptides, and a review of 11 placebo-controlled trials found no reported side effects from collagen supplements. SGS tests on Collagen Glow Berries detected none of the heavy metals, phthalate plasticisers or hormones screened for. It contains fish, so avoid it if you have a fish allergy, and check with your doctor first if you're pregnant, breastfeeding, on medication or have a medical condition.
Is Purest Co collagen safe during pregnancy?
Every one of our collagen labels asks you to check with your doctor first if you're pregnant or breastfeeding, and that's the right first step. Mercury was not detected in the lab reports for any of our six collagen drinks, and Collagen Glow Berries was also screened for 15 hormones, with none detected. You can open every report on our lab tests page and share it with your doctor or midwife.
Is The Purest Co collagen halal?
Collagen Glow Berries is halal-certified by the Taiwan Halal Integrity Development Association, and Marine Collagen Peptides and Marine Collagen Peptides Matcha are halal-certified by JAKIM, the Department of Islamic Development Malaysia. Some certified products don't show the halal logo on the current packaging yet, but they are still certified. All our products are free from porcine-derived ingredients.
Which Purest Co collagen drink has the least sugar?
Collagen Glow Berries Zero has 0 g of sugar per sachet and is sweetened with monk fruit extract and sucralose, with the same 6,000 mg of Wellnex™ marine collagen dipeptides as Collagen Glow Berries. Marine Collagen Peptides Matcha has 0.7 g of sugar per scoop, and Marine Collagen Peptides has 1.8 g. Collagen Glow Berries, Collagen Glow Cremé Yogurt and Collagen Glow Strawberry Smoothie each have 2 g per sachet.
Can I take Purest Co collagen with other supplements?
Yes. Our products can be taken together every day, as long as you follow each one's directions. Each sachet of Collagen Glow Berries, Collagen Glow Berries Zero, Collagen Glow Cremé Yogurt or Collagen Glow Strawberry Smoothie has 250 mg of vitamin C, a quarter of the 1,000 mg daily maximum HSA sets for vitamin C in health supplements. If you take medication or have a health condition, ask your doctor first.
Key takeaways
- Our collagen drinks list every ingredient, with 5,000 mg or 6,000 mg of collagen per serving.
- A review of 11 placebo-controlled trials, most giving 2.5 to 10 g of collagen a day, found no reported side effects.
- Independent lab reports are published for all six, and mercury, arsenic and cadmium were not detected in any of them.
- Collagen Glow Berries was also screened for 15 hormones and 9 phthalate plasticisers, with none detected.
- All six contain fish. Collagen Glow Cremé Yogurt and Marine Collagen Peptides Matcha also contain milk, and Marine Collagen Peptides Matcha has natural caffeine.
- Check with your doctor first if you're pregnant, breastfeeding, on medication or have a medical condition.
About the author: Shereen is a Product Management Associate at The Purest Co. A Master's graduate in Pharmacy from Monash University, she brings four years of research experience to product development, with a focus on evidence-based, thoughtfully formulated supplements that support everyday wellbeing.
References
[1] The Purest Co. Help Center: certified manufacturing, halal-certified products, and advice for pregnancy, breastfeeding and children.
[2] Choi FD, Sung CT, Juhasz ML, Mesinkovsk NA. Oral collagen supplementation: a systematic review of dermatological applications. J Drugs Dermatol. 2019.
[3] Inoue N, Sugihara F, Wang X. Ingestion of bioactive collagen hydrolysates enhance facial skin moisture and elasticity and reduce facial ageing signs in a randomised double-blind placebo-controlled clinical study. J Sci Food Agric. 2016.
[4] Health Sciences Authority. Health supplements: overview. Last updated 30 October 2026.
[5] The Purest Co. Lab tests: published test reports for each product, including SGS heavy metal, phthalate and hormone screens for Collagen Glow Berries.
[6] Health Sciences Authority. The dangers of adulterated, counterfeit and substandard health products. 9 April 2026.
These statements have not been evaluated by any regulatory authority. This product is not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary. Consult a healthcare provider before use if you are pregnant, breastfeeding, or on prescribed medication.