What Is Sea Buckthorn?

Sea buckthorn (Hippophae rhamnoides) is a thorny shrub that grows mostly across China, Mongolia, Russia and northern Europe. Its berries are "astringent, sour, and oily" unless frosted.¹ It also goes by sea berry and Siberian pineapple.² The berries are rarely eaten fresh, because they are too sour and do not keep.⁹

Why it is so sour, and why it smells tropical

The juice is acid-heavy and sugar-light. Malic acid is the main acid, the pH is typically below 3, and the sugar-to-acid ratio is often below 1. In other words, there is more acid than sugar. Tasting panels find intense sourness first, then astringency (the dry, rough feeling strong tea leaves in your mouth) and some bitterness.³

Cultivars differ a lot. In one comparison, Chuiskaya was the sweetest and fruitiest variety and Raisa the sourest and most astringent.³ If you are buying purée, ask which.

The tropical smell comes from fruity esters. A 2024 study named four key odorants in fresh juice: ethyl hexanoate, ethyl 2-methylbutyrate, ethyl 3-methylbutyrate and 3-methylbutyl 3-methylbutanoate.⁴ Ethyl 2-methylbutyrate is also a character-impact odorant of fresh pineapple,⁵ which goes some way to explaining the comparison.

Oil and color: the processing problem

Sea buckthorn is unusual in carrying oil in its flesh. The pulp oil is dark orange, thick and rich in palmitoleic acid, an omega-7 fat. The seed oil is pale yellow and mostly linoleic and alpha-linolenic acid.⁶ Carotenoids dissolve in fat, so much of the color travels with the oil.

That makes cloudy juice hard to hold. In storage it separates into layers, with oil on top and sediment at the bottom. The oil oxidizes quickly, which costs vitamins and color, and oxidized fat tastes stale.⁹

The fixes have a price. High-pressure homogenization keeps the oil suspended, but the juice turns lighter and more yellow, which hurts how consumers accept it. Emulsifiers such as sodium caseinate work well, but the carotenoids bind to the protein and antioxidant activity drops.⁹ Caseinate also makes it a milk-allergen product. Either way you are building an emulsion, so plan for some color shift.

Heat is the other problem. Carotenoids and flavonoids break down, and browning compounds start forming below 60 °C.⁹ Pasteurization also cuts the fruity esters noticeably.⁴ See heat stability.

Making it drinkable

Juice is common in Germany and Scandinavia, often mixed with sweeter juices.¹ It is also sold as purée⁸ and in small shot bottles,⁷ and Finnish confectioner Fazer has paired it with salty caramel in a dark chocolate bar.⁸ Vitamin C varies widely, from about 50 to nearly 900 mg per 100 g across reports,² so test your own lot before you put a number on a label.

Blending with apple or orange is the simplest way to tame it. Three others are worth knowing:

• Count its acid. Sea buckthorn is effectively your acidulant. Cut the added citric acid before you add sugar.
• Use dairy. In yogurt and cheese trials the sourness was largely masked.³ See dairy.
• Ferment it, carefully. Malolactic fermentation converts sharp malic acid into softer lactic acid. One trial raised the pH from 2.86 to 3.13. Run it too long, though, and "sour milk" and yogurt-like off-notes appear.³

The honest limit: sea buckthorn divides people. In one consumer study of nine berries it fell in a less-liked but divisive group, seen as sour, bitter and strong, though some people liked it.³ Soften it too far and it stops tasting like sea buckthorn.