The omega number is an address, not a ranking. It marks where the first double bond sits counting from the tail end of a fatty acid molecule: 3, 6, 7, or 9 carbons in. Omega-3 and omega-6 are essential, your body cannot make them. Omega-7 and omega-9 it can. Sea buckthorn is one of the few plants that stocks all four across its two oils.
What the number means
A fatty acid is a carbon chain with a tail (the omega end) and a head. Count in from the tail and the position of the first double bond gives the name. Omega-3 has its first double bond three carbons in, omega-6 six carbons in, and so on. The position changes how the molecule behaves in the body, which is why chemists and nutritionists bother with the system at all. Bigger number does not mean better. It is geography, not a score.
The four you actually meet
Omega-3 (alpha-linolenic acid). Essential. The seed oil of sea buckthorn carries roughly 20 to 35 percent of it, and the usual food sources are flax, walnuts, and oily fish.
Omega-6 (linoleic acid). Essential. Roughly 30 to 40 percent of sea buckthorn seed oil. Common everywhere in nuts, seeds, and vegetable oils.
Omega-7 (palmitoleic acid). Non-essential, and the reason this site exists. The berry oil is its richest common plant source, per the omega-7 entry.
Omega-9 (oleic acid). Non-essential. The olive oil fat, present modestly in both sea buckthorn oils and abundant in your kitchen already.
On labels: the “complete” blend trick
“Omega 3, 6, 7, 9 complete” on a front label usually means a blend of berry oil and seed oil in one bottle. Complete is a pleasant word with no standard behind it: no rule says how much of each omega, or how much of each oil, earns the claim. The decode is always the same two questions: how much of each fatty acid, and what is the berry-to-seed ratio.
The ratio decides what you are really buying. A seed-heavy blend prints the same four numbers as a berry-heavy one while carrying a fraction of the omega-7, because the seed oil has almost none. Four numbers on the front, one missing on the back.
Why sea buckthorn keeps coming up in this family
Its seed oil carries omega-3 and 6 in a near 1:1 balance, which is unusual, and its berry oil is the famous omega-7 source. Between two oils from one plant, you get the whole family portrait. Ratios get the marketing attention, but absolute amounts decide your intake, so read the milligrams before the ratio. The omega-3, 6, and 9 page covers the seed oil side in full, the seed vs berry comparison splits the two oils, and the glossary hub defines every other term we use.
Where you meet it on this site
The fatty acid profile page puts amounts to all four numbers, the omega-7 research page shows why the berry fraction carries the fame, and the oil buying guide applies the ratio check to real blends.
Related terms: omega-7, palmitoleic acid, tocopherols.
Frequently asked questions
Which omega fatty acids are essential?
Omega-3 and omega-6 are essential, meaning your body cannot make them and they must come from food. Omega-7 and omega-9 are non-essential because your body can produce them. Non-essential does not mean uninteresting, it just means there is no deficiency disease to prevent.
What does an omega 3-6-7-9 blend actually contain?
Usually a mix of sea buckthorn berry oil and seed oil, and the ratio between them varies by brand. Because the seed oil carries almost no omega-7, a seed-heavy blend can print all four numbers while delivering little of the headline one. Look for a fatty-acid breakdown with amounts, not the word complete.