Marine Collagen and Sodium: What a Typical Serving Actually Contains

Marine collagen is not a meaningful source of sodium. At the serving sizes most people use, the salt contribution is small enough that it is unlikely to register on a carefully managed dietary record. But if you are on a medically supervised low-sodium diet, "unlikely to register" is not the same as "irrelevant", and this article walks through the actual numbers.

Where does sodium come from in collagen powder?

Hydrolysed collagen is a protein. The sodium in a collagen powder comes from whatever is naturally present in the raw material after hydrolysis and drying, not from added salt. There are no flavourings, preservatives or fillers in a single-ingredient unflavoured product to introduce additional sodium.

Our Marine Collagen Powder is 100% hydrolysed collagen from wild-caught North Atlantic fish, with no other ingredients. The published macronutrient figure is 90g of protein per 100g. Check the current product label for the declared salt value.

What does the sodium level mean in practice?

UK nutrition labelling rules require salt to be declared on the mandatory nutrition table. Where a value is declared as trace or absent, it indicates the level is at or below the minimum threshold for mandatory declaration.

Published food composition databases for hydrolysed fish collagen as a category report a wide range of sodium values — figures vary considerably depending on the source material, hydrolysis method and processing. Generic ranges from food composition data should not be assumed to apply to any specific product. For the actual sodium content of this product, refer to the nutrition information on the label. If no salt value is shown or it is listed as a trace, your GP or dietitian can advise on whether that is consistent with your specific daily allowance.

For context, the NHS advises adults to consume no more than 6g of salt (roughly 2,400mg of sodium) per day. Those on medically restricted diets are often advised to stay below lower thresholds agreed with their clinician. At the serving sizes typically used for marine collagen powder, the salt contribution is small relative to those daily limits — but if your allowance is medically set, confirm the specific figure with your GP or dietitian rather than relying on a general statement.

Why the protein percentage matters here

Marine collagen being 90g protein per 100g is relevant because it leaves very little room for anything else. Water, ash and incidental minerals make up the remaining 10g. A product with a lower protein percentage, achieved through bulking agents, flavourings or thickeners, would have more opportunity to carry sodium from those additives. A single-ingredient isolate at 90% protein density does not have that headroom. You can read more about what to look for in a marine collagen powder and why label transparency matters.

Is this relevant to blood pressure?

Sodium intake is one dietary factor that clinicians consider alongside blood pressure management. This article makes no claim that collagen affects blood pressure in any direction. The question here is narrower: does taking marine collagen add a meaningful sodium load to the diet? Based on the available information, the answer is no for most people.

If you are on a medically supervised low-sodium diet, the honest answer is that the contribution from a typical marine collagen serving is small, but your GP or dietitian is the right person to confirm whether it fits within your specific daily allowance. Speak to them before adding any supplement to a medically managed regimen.

Fish allergy and suitability

Marine collagen contains fish. It is not suitable for anyone with a fish or shellfish allergy or intolerance. This is a mandatory allergen declaration, not a precautionary one. If you are looking for a collagen product not derived from fish, the Pure Bovine Collagen Powder and Collagen 400mg Capsules are both bovine-derived. A fuller comparison of the two sources is available on our bovine or marine collagen guide.

Serving size affects everything

What serving size is right depends on individual goals and practice, not on sodium management. If you want to think through the serving question separately, that is a different calculation.

The short version on sodium: marine collagen at a typical serving is not a food you need to worry about for salt intake. It is worth knowing, worth checking against your own label, and worth discussing with your GP if your sodium allowance is medically set rather than a general guideline.