Vitamins And Minerals To Improve Memory

Memory is a cognitive process that involves many different steps: encoding, consolidation, recovery, and reconsolidation.

Simply put: your brain acquires or ‘learns’ information through what you see, hear, smell, and feel. This sensory stimuli is then converted into a format that can be processed and retained within neurons (brain cells) so it can be accessed and retrieved later.¹

The way information is obtained and stored can be affected by several factors, including how often you are exposed to it, your attention span, and its emotional significance. Lifestyle factors such as sleep, stress, and the function of various neurotransmitters can also influence memory consolidation.²

Retrieving memories involves activating specific neural pathways while reconstructing encoded information. As with memory storage, the retrieval process can be affected by many factors: the cues you receive and your familiarity with the material, or inadequate cues that impair your ability to recall the information. 

Memory function is generally categorized as sensory, short-term/working, and long-term. Long-term memory is further differentiated into episodic, semantic, and procedural memory. 

These systems relate to how long information is retained, whether it is consciously accessible, and the underlying brain networks involved.

• Sensory memory
  Sensory memory is the fleeting storage of immediate sensory input, such as sights or sounds. Most of this is discarded rapidly to prevent cognitive overload.
  
  
• Short-term and working memory
  Short-term memory holds information for seconds to about a minute, such as remembering a phone number just long enough to dial it. Working memory is also short, but involves actively maintaining information while you need it for ongoing tasks - for example, comparing prices on different items in a supermarket while calculating total spend.
  
  
• Long-term explicit memory
  Explicit memory is the memories and information that require you to consciously think about before remembering, such as the street you grew up on or the name of your first pet. This is stored in the medial temporal lobe structures, particularly the hippocampus.
  Semantic memory: a type of explicit memory as it refers to information and facts about the world around you (the sky is blue, dogs bark, cats meow).
  Episodic memory: also explicit memory as it includes memories linked to a specific moment in your own life, such as your wedding day or a traumatic event.
  
  
• Long-term implicit memory
  Implicit memory includes forms of learning that are expressed through performance rather than conscious recollection, such as habits, skills, priming, and conditioning.
  Procedural memory: a type of implicit memory as it refers to information learned through habits or procedures, such as tying your shoelaces or driving a car.

According to the DSM-5 (Diagnostic and Statistical Manual of Mental Disorders 5th Edition), the six key areas of cognitive function include:

• Complex attention: Sustained and selective attention, including processing speed.
  Example: Reading a report while ignoring office noise then answering questions about it.
  
  
• Executive function: planning, decision making, working memory, responding to feedback, and cognitive flexibility.
  Example: Planning a project timeline, prioritising steps, adjusting the plan after feedback, and implementing a new strategy if necessary.
  
  
• Learning and memory: Immediate, recent, and long-term memory, as well as free recall and recognition.
  Example: Being introduced to someone, remembering their name at lunchtime, and recalling it months later, as well as recognizing them even if you cannot remember their name.
  
  
• Language: Expressive and receptive language, object naming, fluency, and grammar.
  Explaining a concept to someone, understanding their reply, finding the right word for a technical term, and using accurate grammar and sentence structure.
  
  
• Perceptual-motor function: Visual perception, visuoconstructional abilities, and the ability to perform learned movements.
  Example: Reading a map, visualizing a route, drawing it on paper, and following it while driving.
  
  
• Social cognition: Recognition of emotions, theory of mind, and the ability to interpret and respond to social cues.
  Example: Noticing someone looking sad, understanding why from the context, and responding in a supportive way.
  
  

People who say they experience “brain fog” are often describing slowed or hazy thinking, difficulty focusing, confusion, inability to concentrate, and forgetfulness.

B12 deficiency is the nutritional deficiency most commonly associated with cognitive impairment.
Vitamin B12 is required for numerous functions in neuronal health that contribute to memory, especially in maintaining myelin sheath integrity and supporting neurotransmitter production.

B12 assists in the synthesis of oligodendrocytes which make up the myelin sheath; a form of insulation that surrounds axons in the vertebrate nervous system. Healthy myelin is essential for the rapid conduction of nerve impulses and axonal integrity. Myelin is also involved in various aspects of cognition, including memory consolidation and learning.⁴

B12 also works alongside folate to convert homocysteine to methionine, which then creates SAMe for the synthesis of neurotransmitters involved in supporting normal cognitive function.⁵
Deficiency in B12 impairs several biochemical pathways, including the methylation cycle and homocysteine metabolism. Elevated homocysteine can then lead to oxidative stress, vascular damage, and neurodegeneration, all of which contribute to cognitive decline.⁶

Alongside B12, folate is an essential cofactor in pathways linked to neurodegeneration, including one-carbon metabolism, DNA methylation and neurotransmitter synthesis.

Both vitamins are required to efficiently eliminate homocysteine, a toxic amino acid that can cause vascular inflammation and neuronal damage. Deficiency in folate can also lead to insufficient betaine-homocysteine-methyltransferase (BHMT) which further impairs metabolism of homocysteine.⁷


Deficiency in both B vitamins reduces availability of methyl-groups and nucleotides, which further impairs cell regeneration and proliferation required for normal cognitive function. Research suggests that folate levels of less than 11.2 nmol/L predict a decline in global cognitive function, while levels <21.8 nmol/L predict poorer episodic memory. Low folate is an important marker for cognitive decline among older people as is commonly associated with accelerated decline.⁸

A 2022 animal study found that supplementing with methylfolate (the active form of folate) alleviated memory dysfunction and restricted the buildup of tau plaques, which are associated with dementia and memory impairment. The same study found that methylfolate treatment also ameliorated cholinergic damage and endothelial cell dysfunction, improved cellular activity in the hippocampus (the main processor of memories) while reducing oxidative stress.⁹

L‐methylfolate overcomes the limitations associated with the conversion of folic acid to its active form, which are common in the elderly and people with genetic MTHFR C677T variants.¹⁰

Vitamin B6 functions alongside B9 and B12 in homocysteine metabolism and neurotransmitter synthesis. Deficiency can lead to elevated homocysteine, which is associated with vascular inflammation and brain atrophy.¹¹ Research has shown that low B6 levels are associated with  faster cognitive decline over two years, especially in older people and smokers.¹²

The active form of Vitamin B1, thiamine diphosphate (ThDP), is an essential coenzyme for mitochondrial enzymes that convert glucose into energy within the brain. Risk of cognitive impairment is shown to decrease with higher intake of B1.¹³

Magnesium plays a role in supporting the integrity of the blood-brain barrier by preventing oxidative stress and inflammation, as well as maintaining myelin sheaths and myelinated axons and alleviating oxidative damage to neurons.¹⁴

Magnesium L-threonate is shown to raise the magnesium levels in the brain and neurons more effectively than other forms of magnesium as it can cross the blood-brain barrier. A 2022 study found that supplementation with MagteinPS (Magtein + phosphatidylserine, vitamins C and D) resulted in significant improvements in all five memory subtests and overall memory quotient compared with placebo, with older participants showing even greater improvements than younger.¹⁵

Zinc is required for synaptic transmission and neuronal development, and also protects cells against oxidative stress, which accelerates brain aging.¹⁶ Zinc deficiency is shown to impair blood-brain barrier integrity, increase neuroinflammation, and reduce neurotransmitter synthesis.¹⁷ A 2025 study reported that zinc deficiency was associated with a 34% increased risk of developing dementia.¹⁸

Zinc supplementation has been shown to help reduce the risk of dementia and Alzheimer’s disease in middle-aged or older adults, especially among those with cataracts.¹⁹

Vitamin D plays a role in neuroprotection by supporting neuronal development and managing inflammation, which is essential for reducing risk of neurodegenerative diseases. While studies regarding Vitamin D and cognitive function have produced mixed results, a 2025 study found supplementation improved recognition memory in people with low vitamin D and hypertension.²⁰

Omega-3 fatty acids make up much of the structural fat in the brain and support cognitive performance throughout life. DHA is the main omega-3 in the brain and comprises approximately 40% of total fatty acids in neuronal tissue, especially in the gray matter.

DHA may play a role in repairing neuronal damage in the brain. Oxidative stress can trigger conversion of DHA to substances called protectin which support neurons. DHA also decreases inflammatory substances and the inflammatory response.²¹

Dietary intake of omega‑3 from fatty fish or supplements has been shown to lower risk of all‑cause dementia or cognitive decline by ~20%.²²

Several species of plants are known as nootropic agents (cognitive enhancers). The most popular include:

• Ashwagandha: Reduces oxidative damage in the brain and significantly enhances GABA signaling, acetylcholine activity, and antioxidant defenses.²³
• Siberian ginseng: Potent antioxidant and helps protect against neuritic atrophy and cell death from amyloid-beta plaques. Clinical evidence suggests that supplementation of ginseng total extract improves acute working memory performance or cognitive function in healthy individuals and those with subjective memory impairment (SMI), mild cognitive impairment (MCI), or early Alzheimer's disease in those taking AD medication.²⁴
• Bacopa monnieri reduces oxidative stress and inflammation, modulating cholinergic neurotransmission and promoting neurogenesis in the hippocampus, which has been found to improve memory and stress resilience.²⁵
• Ginkgo biloba (especially the standardized extract EGb 761) improves brain function by reducing oxidative stress and inflammation, enhancing cerebral blood flow, and modulating cholinergic and neurotrophic pathways.²⁶