Supplements in 2026: What the Evidence Says for Adults in Richmond, BC

Walk into any pharmacy in Richmond and you will find a long aisle of vitamins, minerals and capsules, each promising more energy, better immunity or healthier ageing. Many adults in Metro Vancouver take at least one supplement every day, often without ever discussing it with a doctor. Some of those products are genuinely useful for certain people. Others add little beyond cost, and a few can cause problems when taken in high doses or alongside prescription medications.

This article looks at four supplements people often ask about — vitamin D, omega-3, magnesium and vitamin B12 — and what the broader body of evidence suggests about each. It is general information, not a personal recommendation.

Start With Food, Then Ask What Is Missing

Canadian nutrition guidance consistently points to the same starting point: a varied diet built around vegetables, fruit, whole grains and protein foods covers most nutrient needs for most healthy adults. Supplements are designed to fill specific gaps, not to replace meals or compensate for an otherwise unbalanced diet.

The useful question is not "Which supplements should I take?" but "Do I have a gap, and why?" Gaps tend to show up in predictable situations:

• Limited sun exposure, especially during long BC winters
• Plant-based or restricted diets
• Older age, when absorption of some nutrients changes
• Pregnancy or planning a pregnancy
• Certain medications or digestive conditions that affect absorption

If one or more apply, a conversation with your family doctor is a better starting point than the supplement aisle.

Vitamin D: The BC Winter Question

Vitamin D is the supplement with the clearest local relevance. Our skin makes vitamin D in response to sunlight, but at Metro Vancouver's latitude, the sun from roughly late fall to early spring is too weak for meaningful production — and grey, rainy days make it harder still. People with darker skin, those who cover most of their skin outdoors, and older adults may produce even less.

Vitamin D supports calcium absorption and bone health, and research has looked at its links with muscle strength and falls in older adults. Health Canada publishes recommended daily intakes by age group, and Canadian guidance generally suggests that adults over 50 consider a daily vitamin D supplement.

A few practical points:

• More is not better. Vitamin D is fat-soluble and is stored in the body. Very high doses taken for long periods can raise blood calcium levels and cause harm.
• Testing is not always needed. In Canada, vitamin D blood levels are reported in nmol/L. Your doctor can tell you whether a test makes sense for your situation or whether a standard dose is reasonable without one.
• Check your total intake. Multivitamins, calcium-vitamin D combinations and fortified foods all add up.

Omega-3: Food First, Capsules With Care

Omega-3 fatty acids (EPA and DHA) are found in oily fish such as salmon, sardines and mackerel. Eating fish regularly is associated with heart health in large population studies, and Canadian dietary guidance encourages fish as part of a healthy eating pattern.

The evidence for fish oil capsules in generally healthy people is more mixed. Some trials suggest benefits in specific groups, particularly people with high triglycerides under medical supervision, while others have found little effect on heart outcomes for the general population. Fish oil can also have mild blood-thinning effects, which matters if you take anticoagulants or antiplatelet medication, or have surgery planned.

If you are considering capsules, discuss the dose and your other medications with your doctor first.

Magnesium: Popular, but Not a Fix for Everything

Magnesium is widely marketed for sleep, muscle cramps, stress and headaches. It plays a role in hundreds of processes in the body, and true deficiency can cause real symptoms. However, the evidence that supplements improve sleep or cramps in people with normal magnesium levels is limited and inconsistent.

Things to be aware of:

• Magnesium supplements commonly cause loose stools, especially at higher doses.
• People with reduced kidney function can accumulate magnesium, so supplements may not be appropriate.
• Magnesium can interfere with the absorption of some antibiotics and osteoporosis medications if taken at the same time.

Persistent cramps, poor sleep or headaches are worth discussing with a physician, since they can have causes a supplement will not address.

Vitamin B12: A Real Gap for Some

Vitamin B12 is needed for healthy nerves and red blood cells. It is found almost exclusively in animal foods, which makes it one of the few supplements that is broadly recommended for people following a vegan diet.

B12 absorption also tends to decline with age, and some common medications — including metformin for diabetes and long-term acid-reducing drugs — are associated with lower B12 levels. Low B12 can develop slowly and show up as fatigue, numbness or tingling, or memory changes, which are easy to attribute to something else.

If you fall into one of these groups, ask your doctor whether checking your B12 is appropriate. Blood test results will guide whether you need a supplement and in what form.

Over-Supplementing and Interactions

Supplements are regulated in Canada as natural health products, and licensed products carry a Natural Product Number (NPN) on the label. That licence speaks to product quality and labelling, but it does not mean a supplement is right for you, or that it is safe to combine with everything else you take.

Common issues include:

• Taking several products that contain the same vitamin, pushing the total dose much higher than intended
• Herbal products that interact with blood thinners, antidepressants or blood pressure medication
• Supplements that can affect certain laboratory results, such as biotin with some thyroid tests
• Stopping or changing a prescription in favour of a supplement without medical advice

The simplest safeguard is to bring all of your bottles — or clear photos of the labels — to your next appointment so your doctor has a complete picture.

How Ongoing Care Helps

Supplement decisions are rarely one-time choices. Your needs change with age, new diagnoses and new medications. Having a family physician who knows your history makes it easier to review what you take, order tests when they are useful, and stop what you no longer need.

For people who want more structured preventive care, a comprehensive health exam can include a broad review of lab work and lifestyle, which gives a useful baseline for these conversations. Our health management membership adds care coordination and follow-up on top of MSP-covered care, so questions like "Should I still be taking this?" do not wait until the next problem appears. Services are available in English, Mandarin and Cantonese.

Book a Consultation

If you are unsure whether the supplements in your cabinet are helping you, a conversation with a physician is a good place to start. MMC Wellness is located at #130 — 8780 Blundell Road in Richmond. Please call 604-629-8968 to book, or contact us to learn more about our health exams and membership program.