A well-planned vegan diet can be excellent for your health. But "well-planned" requires data, not assumptions. B12, iron, vitamin D, and protein status all need monitoring because plant-based diets change the risk profile for specific deficiencies. Testing removes the guesswork.
These are not scare tactics. They are biochemical realities of excluding animal products. Most are easily managed with the right supplementation and dietary awareness. Testing tells you which ones need attention and which are already fine.
B12 is produced by bacteria in soil and animal digestive tracts. It is not reliably available from any plant food. Nutritional yeast and fortified foods provide some, but supplementation is the only guaranteed source on a vegan diet. Deficiency causes fatigue, brain fog, tingling in hands and feet, mood changes, and if prolonged, irreversible nerve damage. The critical point: B12 stores can take 2 to 5 years to deplete. You can feel fine for years while stores are dropping. By the time symptoms appear, damage may have started. Annual testing catches depletion long before this happens. TrueVitals recommends sublingual methylcobalamin, not cyanocobalamin, as the preferred supplementation form.
Plants contain non-haem iron, which has lower bioavailability than haem iron from animal sources. Phytates in grains and legumes, and tannins in tea and coffee, further reduce absorption. Many vegans maintain adequate iron with careful planning (vitamin C with iron-rich meals, avoiding tea with food), but some develop gradual depletion, especially women with menstrual losses. Ferritin alone is not enough. Full iron studies (ferritin, serum iron, TIBC, transferrin saturation) reveal true functional iron status. A ferritin of 30 looks "normal" but a transferrin saturation of 14% confirms you are functionally depleted. Full iron testing guide.
Vitamin D deficiency is endemic in the UK regardless of diet, but vegans have fewer dietary sources. D3 (cholecalciferol) is typically animal-derived, though vegan D3 from lichen is now available. D2 (ergocalciferol) is plant-based but less effective at raising blood levels. Testing confirms your actual level and determines the right supplementation dose. Optimal is 75 to 125 nmol/L. Most UK adults sit well below this, and vegans tend to sit even lower without supplementation.
Getting enough total protein on a vegan diet is achievable but requires deliberate planning. Albumin and total protein in your blood test reflect your body's protein synthesis and nutritional status. Low albumin can indicate inadequate protein intake, chronic inflammation, or liver dysfunction. For active vegans and athletes, protein adequacy directly affects recovery, muscle maintenance, and immune function. Your report cross-references protein markers with your exercise level and dietary data from the lifestyle quiz.
Most vegans have excellent folate levels because plant foods are rich in it. But folate and B12 work together in red blood cell production. High folate with low B12 can mask B12 deficiency anaemia on a standard blood count by keeping MCV normal. This means B12 deficiency progresses silently while the blood count looks fine. Testing both together ensures neither is masking the other. The Ultimate panel includes red cell folate for a more accurate long-term assessment.
Dairy exclusion removes the most concentrated dietary calcium source. Fortified plant milks, tofu set with calcium sulphate, green vegetables, and nuts provide alternatives, but intake needs to be deliberate. Adjusted calcium, vitamin D, phosphate, ALP, and magnesium together assess bone mineral status. Long-term calcium insufficiency increases osteoporosis risk, particularly for post-menopausal vegan women.
Good news: well-planned vegan diets are often rich in magnesium from nuts, seeds, legumes, and whole grains. But phytates can reduce absorption, and some vegans still test low. Magnesium affects sleep, anxiety, muscle function, and insulin sensitivity. Testing confirms whether your dietary intake is translating into adequate blood levels.
Most "vegan blood tests" on the market check B12, iron, vitamin D, and folate. That covers the obvious deficiency risks but misses the broader health picture. A comprehensive panel adds context that changes how you interpret and act on your results.
Low iodine intake on vegan diets can impair thyroid function. Full thyroid testing (TSH, FT3, FT4, antibodies) catches this. Iodine-fortified salt or seaweed are common vegan sources, but intake varies. Thyroid guide.
Vegan diets are typically anti-inflammatory, which is one of their strengths. hs-CRP confirms this. If hs-CRP is elevated on a vegan diet, it suggests other inflammatory drivers (stress, sleep, gut health) that need attention.
Some vegan diets are high in refined carbohydrates, which can drive insulin resistance despite the absence of animal fat. HbA1c and fasting insulin catch this early. A vegan eating wholefood plant-based will have a very different metabolic profile from one relying on processed alternatives.
MCV (mean cell volume) reveals anaemia type. Large red cells suggest B12 or folate deficiency. Small red cells suggest iron deficiency. The FBC is your early warning system for deficiencies before symptoms develop.
Vegan diets typically produce excellent cholesterol profiles. Testing ApoB confirms this and provides a genuine cardiovascular risk baseline. Some vegans have elevated Lp(a) (it is genetic and diet-independent), which testing reveals.
Baseline organ health markers ensure everything is functioning well. ALT, GGT, creatinine, and eGFR provide the full picture. These are the same regardless of diet but complete the health assessment.
B12: Sublingual methylcobalamin, 1000 to 2000 mcg daily or 5000 mcg twice weekly. Non-negotiable on a vegan diet.
Vitamin D3: Vegan D3 from lichen, 1000 to 4000 IU daily depending on current levels. Higher doses in winter, lower in summer after testing.
Iron: Only supplement if testing confirms deficiency. Iron overload is dangerous. Iron bisglycinate every other day with vitamin C if needed.
Calcium: If dietary intake is adequate from fortified foods, supplementation may not be needed. Test first.
Iodine: If thyroid markers are normal and you use iodised salt or seaweed regularly, supplementation may be unnecessary.
Your TrueVitals report gives specific supplementation recommendations based on your actual levels, not generic vegan supplement advice. If your B12 is already optimal from current supplementation, your report confirms that. If your iron is depleting despite dietary effort, your report recommends the right form, dose, and timing. Vitamin testing guide.
B12, full iron studies, vitamin D, folate, full blood count (MCV), total protein and albumin, calcium, magnesium, full thyroid, HbA1c, ApoB, and hs-CRP. TrueVitals Advanced (74 markers, £269) covers all of these. The Ultimate panel (114 markers, £349) adds insulin, Lp(a), red cell folate, and tumour markers.
Annually at minimum. In your first 1 to 2 years of being vegan, every 6 months is advisable as your body transitions and stores deplete at different rates. B12 stores can take years to drop, so early testing catches the trend before it becomes a problem.
Yes. Vegetarians have the same B12 risk (dairy and eggs provide some but often not enough), similar iron absorption challenges (though less severe than vegans), and the same vitamin D concerns. Lacto-ovo vegetarians have lower calcium risk but should still test to confirm. The same panel works for both diets.
No. B12 has very low absorption rates, especially in oral form. High-dose supplements compensate for this. Excess B12 is water-soluble and excreted. There is no established upper toxicity limit. Testing confirms whether your current dose is maintaining adequate blood levels. If levels are very high, you can reduce the dose.
The Advanced panel (74 markers, £269) covers every vegan-priority nutrient plus full thyroid, liver, kidney, cardiovascular, and inflammatory markers. The Ultimate (114, £349) adds insulin, Lp(a), red cell folate, hormones, and tumour markers for the complete picture. Both are excellent choices. Compare panels.
B12, iron, vitamin D, protein, calcium, thyroid, and 60+ other markers. Know what your vegan diet is delivering and what it is missing. From £269.
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