Optimal Ranges
What is the optimal range for ALP?
Clinical (NHS) Range
30-130 U/L
U/L
Performance-Optimised Range
40-90 U/L
U/L
| Range | Value | Unit |
|---|---|---|
| Clinical (NHS) reference range | 30-130 U/L | U/L |
| Performance-optimised range | 40-90 U/L | U/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 ALP matters for performance
Elevated ALP is the earliest blood signal of cholestatic liver problems (where bile flow is blocked) and is also a sensitive marker of bone turnover — useful in osteopenia, fracture risk, and vitamin D deficiency contexts. Low ALP is less common but can flag zinc or magnesium deficiency, hypothyroidism, or rare metabolic conditions. For longevity scoring, a stable ALP in the lower-middle of the reference range correlates with slower biological ageing.
Symptoms
What are the symptoms of low or high ALP?
Low / Deficiency
- Often asymptomatic — found incidentally
- Possible bone aches if from low zinc
- Fatigue if underlying thyroid issue
High / Excess
- Itching (from cholestasis)
- Right-upper-quadrant abdominal discomfort
- Bone pain (if from bone turnover)
- Pale stools or dark urine (in obstructive picture)
Dietary Sources
Which foods support ALP levels?
Supplementation
How do you improve ALP levels?
If ALP is suboptimal-low, investigate zinc, magnesium, and B6 status first — these are the enzymatic cofactors. If ALP is rising, the next step is fractionation (bone vs liver) and a vitamin D check, not a supplement. ALP is read alongside GGT (liver) and calcium (bone) to localise the source.
Testing
How is ALP tested in the UK?
ALP 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 (30-130 U/L) and the performance-optimal range (40-90 U/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
An epigenetic biomarker of aging for lifespan and healthspan
Levine ME, Lu AT, Quach A, et al.
Aging (Albany NY) (2018)
DOI: 10.18632/aging.101414Related Biomarkers
Related Guides
Explore ALP in depth
Test your ALP levels
ALP 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.