Helvy
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Vitamins & Minerals
In the UK, the standard clinical (NHS) reference range for Folate (Vitamin B9) is >7 nmol/L, with 20-45 nmol/L considered the performance-optimised range. A result within these ranges suggests typical status; only a qualified clinician can interpret an individual reading.
Folate (vitamin B9) is a water-soluble B vitamin essential for DNA synthesis, methylation, and red blood cell formation. Serum folate reflects recent dietary intake (1-3 weeks), while red blood cell folate reflects longer-term status (3-4 months). Folate works synergistically with vitamin B12 — deficiency in either can cause megaloblastic anaemia.
Optimal range · UK
20-45 nmol/L
Performance-optimised band · clinical (NHS) range >7 nmol/L
Clinical (NHS)
>7 nmol/L
Performance
20-45 nmol/L
Reference ranges for Folate, not a personal result. Any individual reading should be interpreted by a qualified clinician.
Optimal ranges
| Range | Value |
|---|---|
| Clinical (NHS) reference range | >7 nmol/L |
| Performance-optimised range | 20-45 nmol/L |
The clinical range defines what is considered medically “normal” — broad enough to cover 95% of the population. The performance range reflects where research and clinical experience suggest most people feel and function at their best. A result in either range suggests typical status and is not a diagnosis; any individual reading should be interpreted by a qualified clinician.
Why it matters
Folate is critical for methylation — the biochemical process that regulates gene expression, neurotransmitter production, and homocysteine metabolism. Low folate drives up homocysteine, an independent cardiovascular risk factor. For active men, folate supports nitric oxide production (affecting blood flow and exercise performance) and is essential for DNA repair after training-induced cellular stress. The MTHFR gene variant (carried by ~40% of the population) impairs folate conversion, making some men particularly vulnerable to deficiency even with adequate dietary intake.
Symptoms
Low / Deficiency
High / Excess
Dietary sources
Supplementation
Methylfolate (5-MTHF) is the preferred supplemental form as it bypasses the MTHFR conversion step, making it effective regardless of genetic variant. Standard dose is 400-800mcg daily; those with confirmed MTHFR variants or elevated homocysteine may benefit from 1-5mg under medical guidance. Always take alongside B12 — folate supplementation alone can mask B12 deficiency. Folic acid (the synthetic form) is cheaper but requires enzymatic conversion and may be less effective in MTHFR carriers.
Testing
Folate is measured from a blood sample. With Helvy, that means a finger-prick kit taken at home and posted to a UKAS-accredited UK laboratory, with results in around 5 days, reviewed by a qualified clinician. Your result is reported against both the clinical range (>7 nmol/L) and the performance-optimal range (20-45 nmol/L), so you can see not just whether you are “normal” but whether you are optimal. If you make a change, retest after 8-12 weeks to confirm it worked.
Research
Folate and disease prevention
Stover PJ, Field MS
The American Journal of Clinical Nutrition (2022)
DOI: 10.1093/ajcn/nqab431Related biomarkers
Related guides
This content is for educational purposes only and does not constitute medical advice. Your data suggests areas for optimisation, but any concerns should be discussed with a qualified healthcare professional. If your results flag values outside safe ranges, we recommend consulting your GP.
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