Evidence supporting the use of: Fish
For the body system: Nails

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Table of Contents

Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Fish, particularly fatty fish such as salmon, mackerel, and sardines, are recognized as valuable dietary sources of high-quality protein and essential nutrients, including omega-3 fatty acids, vitamin D, and various minerals. Scientific studies show that the protein and omega-3s found in fish are important for supporting the structure and health of keratin-based tissues, which include nails. Protein provides the amino acids necessary for keratin synthesis, directly contributing to nail strength and growth. Additionally, omega-3 fatty acids possess anti-inflammatory properties that may indirectly support nail health by improving circulation and reducing inflammation around the nail bed.

Some research has linked deficiencies in protein or certain micronutrients—several of which are found in fish—to brittle or slow-growing nails. However, there is limited direct clinical research specifically focusing on fish consumption and nail health in humans. Most evidence comes from nutritional studies examining the effects of protein and healthy fats on skin, hair, and nails collectively. While fish oil supplements are sometimes recommended for brittle nails due to their omega-3 content, the supporting evidence is moderate rather than strong.

In summary, there is a reasonable scientific rationale for fish contributing to nail health, mainly through its protein and nutrient content, but direct evidence specifically focusing on nails is limited, resulting in a moderate evidence rating.

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