The collagen supplement market has grown so fast that product quality is extraordinarily variable. There are supplements with reference ingredients at functional doses backed by studies, and there are products with collagen of unknown origin at doses that would barely allow them to appear on the label. The difference between them is not always obvious to the buyer, but it is entirely readable if you know what to look for.
First thing to look for: the source of collagen
The first piece of information that reveals the quality of a collagen supplement is the source of the ingredient. A product that only says "hydrolyzed marine collagen" without specifying the brand of the ingredient or its origin may be using a source without its own clinical studies and without documented traceability. Reference ingredients with published studies—Peptan® (Rousselot), Verisol® (Gelita), BioCell Collagen®—always appear with their trade name on the labels of products that use them, because it is part of their value proposition.
What is molecular weight and why does it matter for absorption?
Native collagen has a molecular weight of approximately 300,000 daltons: too large to be absorbed intact. Hydrolysis reduces it to smaller peptides. The key is how much it is reduced and what size distribution results: smaller peptides (di- and tripeptides, <1,000 daltons) are the most bioactive but also the most difficult to obtain consistently. A good supplement specifies the average molecular weight of its hydrolysate; a generic one does not mention it.
Dosage: how much is enough and how much is marketing
Clinical studies with the best results in skin parameters have worked with hydrolyzed collagen doses between 2.5 g and 10 g daily. Most of the most cited trials use between 5 g and 10 g/day. A supplement that includes "marine collagen" but at 500 mg or 1 g per dose is an order of magnitude below the doses evaluated in clinical research. It is not a technical error: it is a cost choice that results in a product that may not produce the effects documented in the studies it cites in its marketing.
LEVIAL includes 8,000 mg (8 g) of Peptan® per vial, within the functional range evaluated in studies with the best results.
Cofactors: what a good supplement always includes
A collagen supplement that does not include vitamin C is incomplete by design. Prolyl-4-hydroxylase needs vitamin C as an essential cofactor. A supplement that does not include zinc, selenium, or copper misses the opportunity to cover the mineral cofactors that also participate in collagen synthesis and protection. The presence and dosage of these cofactors is an indicator that the formulator thought of the formula as a system, not as a list of trendy ingredients.
Excipients, sugars, and additives: what no one tells you
Powder and liquid collagen supplements often need to mask the flavor with varying amounts of sugars, sweeteners, flavorings, or aromas. Some have more added sugar than some desserts. Checking the "other ingredients" section on the label and the complete nutritional table—not just the list of active ingredients—is essential to know exactly what you are taking.
Seals and certifications: which ones have real value
The most relevant certifications in supplementation are: GMP (Good Manufacturing Practices), ISO 22000 for food safety, and the certifications of the ingredients themselves (such as those accompanying Peptan® or AstaReal®). Seals such as "natural," "clean label," or similar do not have a standardized regulatory definition and should be viewed with caution. The designation "food supplement" in Europe implies compliance with Directive 2002/46/EC, which establishes safety and notification requirements.
Checklist: 10 questions before buying
1. Is the brand of the collagen ingredient and its origin specified? 2. Is the molecular weight of the hydrolysate indicated? 3. Is the collagen dose at least 5 g per serving? 4. Does it include vitamin C as a cofactor? 5. Does it include mineral cofactors (zinc, selenium, copper)? 6. Are the claims used authorized by EFSA? 7. Are all excipients and added sugars declared? 8. Are there published clinical studies with the specific ingredient? 9. Does the format facilitate daily adherence? 10. Is the price consistent with the declared quality or is there a large gap?
