Empty brown glass bottle for Halibut Liver oil capsules, containing vitamins A and D, by Boots, Nottingham, 1950-1970

Halibut oil is a rich source of vitamins A and D. Vitamin A helps support the immune system and eye sight and vitamin D supports bone growth by regulating the amount of calcium and phosphate in the body. Vitamin D is known as the 'sunshine' vitamin as sunlight triggers vitamin D production in our skin. In darker months, with less daylight hours, vitamin D production is supported by diet, such as oily fish, and by supplements.