Vitamin B1 (Thiamine)

Vitamin B1, also known as thiamine, is an essential water-soluble vitamin that helps convert carbohydrates into energy and supports healthy nervous system function. Every cell in the body relies on thiamine to help produce energy from food.

Primary Functions of Vitamin B1

• Converts carbohydrates into usable energy
• Supports healthy nerve signaling
• Helps maintain normal heart function
• Supports muscle contraction and coordination
• Assists healthy brain function
• Contributes to cellular metabolism

Potential Health Benefits of Vitamin B1 (Thiamine)

• Supports daily energy levels
• Promotes healthy cognitive performance
• Supports memory and concentration
• Helps maintain cardiovascular health
• Supports proper nervous system function
• Contributes to healthy digestion and appetite
• Supports muscle performance
• Assists glucose metabolism

Possible Signs of Deficiency of Vitamin B1 (Thiamine)

• Fatigue
• Irritability
• Poor concentration
• Muscle weakness
• Reduced appetite
• Nerve-related symptoms

Best Food Sources of Vitamin B1 (Thiamine)

• Pork
• Whole grains
• Brown rice
• Beans
• Lentils
• Sunflower seeds
• Nuts

US Government Recommended Daily Intake of Vitamin B1 (Thiamine) (Which is usually always too low.)

Adult Men: 1.2 mg daily
Adult Women: 1.1 mg daily

Highest Safe Daily Intake of Vitamin B1 (Thiamine)

No official Upper Intake Level (UL) has been established because thiamine has extremely low toxicity and excess amounts are typically excreted in urine.

Supplement Notes

Thiamine supplements are commonly included in B-complex formulas. Some individuals may require higher amounts under medical supervision, particularly when deficiency is present.

Vitamin B2 (Riboflavin)

Vitamin B2, known as riboflavin, is essential for energy production, cellular growth, antioxidant protection, and healthy skin and eye function.

Primary Functions of Vitamin B2

• Supports cellular energy production
• Assists fat, protein, and carbohydrate metabolism
• Supports antioxidant activity
• Helps maintain healthy vision
• Supports red blood cell production
• Contributes to tissue repair

Potential Health Benefits of Vitamin B2 (Riboflavin)

• Supports healthy energy levels
• Promotes healthy skin
• Supports eye health
• Helps combat oxidative stress
• Supports healthy aging
• Contributes to healthy iron metabolism
• Supports healthy cellular repair
• May help support migraine prevention in some individuals

Possible Signs of Deficiency of Vitamin B2 (Riboflavin)

• Cracked lips
• Sore throat
• Skin irritation
• Eye sensitivity
• Fatigue
• Mouth inflammation

Best Food Sources of Vitamin B2 (Riboflavin)

• Milk
• Yogurt
• Eggs
• Almonds
• Lean meats
• Leafy greens

US Government Recommended Daily Intake of Vitamin B2 (Riboflavin) (Which is usually always too low.)

Adult Men: 1.3 mg daily
Adult Women: 1.1 mg daily

Highest Safe Daily Intake of Vitamin B2 (Riboflavin)

No official Upper Intake Level (UL) has been established for riboflavin due to its excellent safety profile.

Supplement Notes

High-dose riboflavin may cause bright yellow urine, which is harmless and simply indicates excess vitamin being excreted.

Vitamin B3 (Niacin/Niacinamide)

Vitamin B3, also known as niacin, plays a vital role in hundreds of metabolic reactions that help produce energy, maintain healthy skin, and support cardiovascular function.

Primary Functions of Vitamin B3

• Supports energy metabolism
• Promotes healthy circulation
• Supports nervous system function
• Assists DNA repair
• Supports healthy skin
• Contributes to cellular communication
• Extremely important and helpful for mental health including schizophrenia.

Potential Health Benefits of Vitamin B3 (Niacin/Niacinamide)

• Supports cardiovascular wellness
• Promotes healthy blood flow
• Supports brain function
• Helps maintain healthy cholesterol levels already within the normal range
• Supports healthy skin appearance
• Contributes to energy production
• Supports nervous system health
• Assists healthy cellular repair

Possible Signs of Deficiency of Vitamin B3 (Niacin/Niacinamide)

• Fatigue
• Skin abnormalities
• Digestive issues
• Mental confusion
• Poor appetite
• Weakness

Best Food Sources of Vitamin B3 (Niacin/Niacinamide)

• Chicken
• Turkey
• Tuna
• Salmon (Eat "wild caught" Salmon only.)
• Peanuts
• Whole grains

US Government Recommended Daily Intake of Vitamin B3 (Niacin/Niacinamide) (Which is usually always too low.)

Adult Men: 16 mg daily
Adult Women: 14 mg daily

Highest Safe Daily Intake of Vitamin B3 (Niacin/Niacinamide)

Most people only need a max of 35 mg daily from supplements and fortified foods. However, people with severe mental illness including schizophrenia may use 1,000 mg and even up to 3,000 mg daily. For high dosages, use the non-flushing niacinamide, and take in divided dosages throughout the day.

Supplement Notes

Higher doses may cause niacin flushing, itching, redness, pounding & racing heart. It can be very scary/frightening. Use at your own risk.

Vitamin B5 (Pantothenic Acid)

Vitamin B5, also known as pantothenic acid, is found in nearly every living cell and is essential for producing energy from food. It is a key component of coenzyme A, a molecule involved in hundreds of metabolic reactions throughout the body.

Primary Functions of Vitamin B5

• Supports energy production from fats, proteins, and carbohydrates
• Assists in the synthesis of coenzyme A
• Supports hormone production in the adrenal glands
• Contributes to cholesterol metabolism
• Supports healthy nervous system function
• Assists cellular repair and maintenance

Potential Health Benefits of Vitamin B5 (Pantothenic Acid)

• Supports healthy energy levels
• Promotes adrenal gland function
• Supports the body's response to physical stress
• Assists healthy skin maintenance
• Supports wound healing processes
• Promotes healthy cholesterol metabolism
• Supports neurotransmitter production
• Contributes to overall metabolic health

Possible Signs of Deficiency of Vitamin B5 (Pantothenic Acid)

• Fatigue
• Irritability
• Sleep disturbances
• Headaches
• Digestive discomfort
• Numbness or tingling sensations

Best Food Sources of Vitamin B5 (Pantothenic Acid)

• Chicken
• Beef
• Eggs
• Avocados
• Whole grains
• Sweet potatoes

US Government Recommended Daily Intake of Vitamin B5 (Pantothenic Acid) (Which is usually always too low.)

Adult Men: 5 mg daily
Adult Women: 5 mg daily

Highest Safe Daily Intake of Vitamin B5 (Pantothenic Acid)

No official Upper Intake Level (UL) has been established. Pantothenic acid has a very low risk of toxicity.

Supplement Notes

Very high supplemental doses may occasionally cause mild digestive upset or diarrhea in some individuals.

Vitamin B6 (Pyridoxine)

Vitamin B6 is one of the most versatile B vitamins and participates in more than 100 enzyme reactions. It plays a major role in brain health, immune function, amino acid metabolism, and red blood cell formation.

Primary Functions of Vitamin B6

• Supports neurotransmitter production
• Assists protein metabolism
• Supports healthy immune function
• Contributes to red blood cell formation
• Helps regulate homocysteine metabolism
• Supports nervous system health
• Good for mental health (Especially the form called P-5-P: Pyridoxal-5-Phosphate)

Potential Health Benefits of Vitamin B6

• Supports memory and concentration
• Promotes healthy mood regulation
• Assists serotonin production
• Supports dopamine synthesis
• Contributes to healthy sleep patterns
• Supports cardiovascular wellness
• Promotes healthy immune responses
• Supports healthy brain aging
• Helps maintain healthy nerve function
• Great for nerve pain including carpel tunnel syndrome.

Possible Signs of Deficiency of Vitamin B6

• Fatigue
• Depressed mood
• Irritability
• Brain fog
• Numbness
• Weakened immune function
• Skin abnormalities

Best Food Sources of Vitamin B6

• Chicken
• Turkey
• Salmon (Eat "wild caught" salmon only.)
• Bananas
• Potatoes
• Chickpeas

US Government Recommended Daily Intake of Vitamin B6 (Which is usually always too low.)

Adults 19–50: 1.3 mg daily
Men Over 50: 1.7 mg daily
Women Over 50: 1.5 mg daily

Highest Safe Daily Intake of Vitamin B6

100 mg daily. This is the dosage needed for nerve pain. Do not go over 100 mg daily. You could rotate between this dosage and skullcap (a herb) for nerve pain.

Supplement Notes

Long-term use of excessive doses above the established upper limit may result in nerve-related side effects, including numbness and tingling.

Vitamin B7 (Biotin)

Vitamin B7, commonly known as biotin, helps the body metabolize fats, proteins, and carbohydrates. It is best known for supporting healthy hair, skin, and nails.

Primary Functions of Vitamin B7

• Supports carbohydrate metabolism
• Assists fat metabolism
• Supports protein utilization
• Contributes to healthy skin maintenance
• Supports nervous system health
• Assists energy production

Potential Health Benefits of Vitamin B7

• Supports healthy hair growth
• Promotes stronger nails
• Supports healthy skin appearance
• Assists glucose metabolism
• Contributes to cellular energy production
• Supports healthy nervous system function
• Helps maintain normal enzyme activity

Possible Signs of Deficiency of Vitamin B7

• Hair thinning
• Brittle nails
• Skin rashes
• Fatigue
• Depressed mood
• Numbness or tingling sensations

Best Food Sources of Vitamin B7

• Egg yolks
• Salmon (Always eat "Wild caught" salmon only.)
• Almonds
• Walnuts
• Sweet potatoes
• Avocados
• Seeds

US Government Recommended Daily Intake of Vitamin B7 (Which is usually always too low.)

Adult Men: 30 mcg daily
Adult Women: 30 mcg daily

Highest Safe Daily Intake of Vitamin B7

No official Upper Intake Level (UL) has been established.

Supplement Notes

High-dose biotin supplements can interfere with certain blood tests, including thyroid and cardiac laboratory testing.

Vitamin B9 (Folate)

Vitamin B9, known as folate, is crucial for DNA synthesis, cell division, tissue growth, and red blood cell production. It is especially important during pregnancy because it supports fetal development.

Alert: Folic acid is the fake synthetic form found in many supplements. It is not good for your health, but actually bad for you. Avoid folic acid. Buy only the real natural form: folate.

Primary Functions of Vitamin B9 (Folate)

• Supports DNA synthesis
• Promotes healthy cell division
• Assists red blood cell production
• Supports fetal development
• Helps regulate homocysteine metabolism
• Supports healthy tissue growth

Potential Health Benefits of Vitamin B9 (Folate)

• Supports cardiovascular health
• Promotes healthy cognitive function
• Supports healthy brain development
• Contributes to healthy pregnancy outcomes
• Supports healthy red blood cell formation
• Assists tissue repair and regeneration
• Supports overall cellular health
• Promotes healthy nervous system development

Possible Signs of Deficiency of Vitamin B9 (Folate)

• Fatigue
• Weakness
• Pale skin
• Difficulty concentrating
• Irritability
• Anemia

Best Food Sources of Vitamin B9 (Folate)

• Spinach
• Kale
• Broccoli
• Asparagus
• Lentils
• Black beans
• Chickpeas

US Government Recommended Daily Intake of Vitamin B9 (Folate) (Which is usually always too low.)

Adult Men: 400 mcg daily
Adult Women: 400 mcg daily

Highest Safe Daily Intake of Vitamin B9 (Folate)

1,000 mcg daily of folic acid from supplements and fortified foods.

Supplement Notes

Excessive folic acid intake may mask symptoms of vitamin B12 deficiency. Individuals taking high-dose folic acid should ensure adequate B12 status.

Vitamin B12 (Cobalamin, methylcobalamin, adenosylcobalamin)

Vitamin B12 is essential for neurological function, DNA synthesis, energy metabolism, and red blood cell production. It is found primarily in animal foods, making deficiency more common among strict vegetarians and vegans.

Important: Cobalamin, or vitamin B12, exists in both natural forms (methylcobalamin and adenosylcobalamin) found in animal products and a synthetic form (cyanocobalamin) commonly used in supplements. Avoid cyanocobalamin which is the fake lab chemical.
The word "cobalamin" doesn't indicate whether it's the real version or the lab/fake version. So you must look for methylcobalamin or adenosylcobalamin for the real versions.

Primary Functions of Vitamin B12

• Supports healthy nerve function
• Assists DNA synthesis
• Promotes red blood cell production
• Supports energy metabolism
• Helps maintain healthy cognitive function
• Supports myelin sheath formation around nerves

Potential Health Benefits of Vitamin B12

• Gives energy, more than any other vitamin B.
• Supports memory and concentration
• Promotes healthy neurological function
• Supports healthy mood regulation
• Contributes to healthy energy levels
• Supports oxygen transport throughout the body
• Promotes healthy brain aging
• Supports cardiovascular wellness
• Helps maintain healthy nerve tissue
• Supports DNA replication and repair

Possible Signs of Deficiency of Vitamin B12

• Fatigue
• Weakness
• Brain fog
• Memory difficulties
• Numbness or tingling
• Balance problems
• Anemia
• Mood changes

Best Food Sources of Vitamin B12

• Beef
• Liver
• Salmon (Always eat only the "wild caught" salmon.)
• Eggs
• Dairy products, organic whole milk, real milk yogurt, raw milk.

US Government Recommended Daily Intake of Vitamin B12 (Which is usually always too low.)

Adult Men: 2.4 mcg daily
Adult Women: 2.4 mcg daily

Highest Safe Daily Intake of Vitamin B12

No official Upper Intake Level (UL) has been established because vitamin B12 has demonstrated an excellent safety profile.

Supplement Notes

Absorption of vitamin B12 often declines with age. Adults over age 50 frequently benefit from fortified foods or supplements because they may absorb crystalline B12 more efficiently than naturally occurring food sources.
Take Vitamin B12 only very early in the morning with food. If you take it in the afternoon, it will keep you awake all night.

How All B Vitamins Work Together

Although each B vitamin has unique functions, they work together as a team to support optimal health. B vitamins are involved in energy production, nervous system maintenance, cardiovascular function, immune support, hormone regulation, red blood cell formation, and cellular repair.
All B vitamins are important for overall general health and mental/brain support and immunity.

Many healthcare professionals recommend obtaining all eight B vitamins through a nutrient-rich diet or a balanced B-complex supplement because deficiencies in one B vitamin are often associated with deficiencies in others.

Final Thoughts

The B-complex vitamins are among the most important nutrients for human health. They help power the body's energy systems, support healthy brain and nerve function, promote cardiovascular wellness, assist tissue repair, and contribute to healthy aging. Maintaining adequate levels of B1, B2, B3, B5, B6, B7, B9, and B12 can help support overall wellness, vitality, and long-term health.

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