Optimal Ranges
What is the optimal range for Folate?
Clinical (NHS) Range
>7 nmol/L
nmol/L
Performance-Optimised Range
20-45 nmol/L
nmol/L
| Range | Value | Unit |
|---|---|---|
| Clinical (NHS) reference range | >7 nmol/L | nmol/L |
| Performance-optimised range | 20-45 nmol/L | 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
Why Folate matters for performance
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
What are the symptoms of low or high Folate?
Low / Deficiency
- Fatigue and weakness
- Brain fog and poor concentration
- Mouth ulcers and sore tongue
- Irritability and low mood
- Shortness of breath
High / Excess
- May mask B12 deficiency symptoms
- High doses (>1mg) can interfere with certain medications
Dietary Sources
Which foods support Folate levels?
Supplementation
How do you improve Folate levels?
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
How is Folate tested in the UK?
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
Key study
Folate and disease prevention
Stover PJ, Field MS
The American Journal of Clinical Nutrition (2022)
DOI: 10.1093/ajcn/nqab431Related Biomarkers
Related Guides
Explore Folate in depth
Test your Folate levels
Folate is included in the Helvy 50+ biomarker panel. Get your results in 5 days with a personalised protocol.
Order Your TestThis 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.