Cao Cấp 40 Độ Đạm is a premium traditional fish sauce produced by Vạn Phần in Nghệ An Province. It belongs to the company’s concentrated fish sauce range and represents a higher-quality portion of the liquid extracted from the fermented fish mixture. It is made exclusively from fresh black anchovies and sea salt, with no added preservatives or other additives. The anchovies are mixed with salt and naturally fermented in traditional wooden barrels. Products of this type are generally matured by the producer for 12 to 24 months. During fermentation, the fish proteins break down into soluble compounds and natural amino acids that give the sauce its umami character. The 40N designation corresponds to a total nitrogen content of approximately 39 to 41 grams per litre. Amino acid nitrogen accounts for at least 55 percent of the total nitrogen content. The salt content does not exceed 20.9 grams per 100 grams, while the histamine level remains below 400 milligrams per litre. The sauce has a natural honey-brown colour, a relatively dense texture and a pronounced aroma of matured anchovies. Its flavour is intensely savoury and rich in umami, with a characteristic naturally sweet finish. It can be used as a dipping sauce or for marinating, cooking and finishing dishes.