hippophæ rhamnoides smells like vomitus to me. However...

It is an [wonder] herb. Its leaves, flowers, and fruit (berries) are used to producing medicine. In foods, sea buckthorn berries are used to make jellies, juices, purees, and sauces. In manufacturing, the herb is used in cosmetics and anti-aging products.

The leaves and flowers are used for treating arthritis, gastrointestinal ulcers, gout, and skin rashes caused by infectious diseases such as the measles.
The leaves are used (in a tea) as a source of vitamins, antioxidants, protein building blocks (amino acids), fatty acids and minerals, for improving blood pressure and lowering cholesterol, preventing and controlling blood vessel diseases, and boosting immunity.

The berries are used for preventing infections, improving sight, and slowing the aging process. Sea buckthorn contains vitamins A, B1, B2, B6, C, and other nutritional elements. It might even help prevent symptoms of stomach and intestinal ulcers, and heartburn.

The oil of the seed or berry is used as an expectorant for loosening phlegm [anti-histamine], for treating asthma, heart disorders including chest pain (angina) and high cholesterol*, for preventing blood vessel disease, and as an antioxidant. The oil is also used for slowing the decline of thinking skills with age, reducing illness due to cancer, as well as limiting the toxicity of chemical cancer treatment (chemotherapy), balancing the immune system, treating stomach and intestinal diseases including ulcers and reflux esophagitis (GERD ), treating night blindness and dry eye , and as a supplemental source of vitamins C, A, and E, beta-carotene, minerals, amino acids, and fatty acids.

Some people apply sea buckthorn berries, berry concentrate, and berry or seed oil directly to the skin for preventing sunburn, for treating radiation damage, from x-rays and sunburns, for healing wounds including bedsores, burns, and cuts, for acne , dermatitis , dry skin , eczema , skin ulcers, and skin colour changes after giving birth , and for protecting mucus membranes.

* high levels of LDL ‘bad’ cholesterol: (Low Density Lipoproteins), HDL ‘good’ cholesterol