As the body excretes water-soluble vitamins in urine, we're unlikely to experience serious side effects from having excess amounts.
B1 - Thiamin
We get vitamin B1 from pork and other meats, wholemeal bread, fortified breakfast cereals, milk etc.
We need vitamin B1 to support our nervous system and help to release energy from carbohydrates.
Symptoms of having too little vitamin B1 include: weakened muscles, fatigue and beriberi (a disease affecting blood vessels, the heart and nervous system).
B9 - Folic Acid/Folate
We get B9 from green leafy vegetables, yeast extract, chickpeas, asparagus etc.
We need B9 for growth and producing healthy babies.
Both B9 and B12 form red blood cells.
Symptoms of having too little B9 include fatigue, muscle weakening and megaloblastic anaemia.
It's very important that women get enough folic acid. Deficient folic acid at conception can lead to spina bifida in offspring.
B12 - Cobalamin
We get B12 from liver, cheese, yeast, fish, eggs etc.
We need B12 to help our nervous systems function properly and to make healthy red blood cells.
Symptoms of having too little B12 include fatigue, nerve damage and pernicious anaemia.
Because vegans don't eat animal products, they're in danger of being B12 deficient.
B3 - Niacin
We get B3 from pork, beef, wheat and maize flour, eggs etc.
B3 helps to release energy from foods. We need B3 for healthy skin and a healthy nervous system.
A symptom of having too little vitamin B3 is a disease called pellagra, which causes diarrhoea, dementia, and sores in the mouth.
C - Ascorbic acid
We get vitamin C from citrus fruits, kiwifruit, blackcurrants, cabbage, Brussels sprouts, new potatoes etc.
We need vitamin C to fight infection and to protect our bodies from allergies.
Vitamin C helps us to heal wounds and maintain healthy blood vessels.
Symptoms of having too little vitamin C include scurvy, a condition that causes fatigue and bleeding gums, and anaemia.
Vitamin C is an antioxidant. It's really important that we get enough, as we can increase the risk of getting cancer from having too little.
B2 - Riboflavin
We get vitamin B2 from milk, fortified breakfast rice, mushrooms and eggs.
We need vitamin B2 for tissue repair and to help release energy from carbohydrates, fats and proteins.
Symptoms from having too little vitamin B2 include mouth sores, a sore throat and dry skin.