Retest 01 · 27 October 2026 · bioprint TR-23BC2F56
Twelve weeks.
Here is what moved.
A finger-prick test at the start, another twelve weeks later, on four markers your formula was actually built to shift. Not a hundred numbers you cannot act on. Four you can.
These readings are illustrative
What is real and what is not →Nobody has been tested yet. The markers, the thresholds and the honesty about which nutrients can and cannot be measured are real; the numbers are seeded to show the screen.
Your four markers
Hollow dot: where you started. Filled: where you are now.
Vitamin D (25-OH)
31→79nmol/L
50
100
Vitamin D (25-OH): started at 31 nmol/L, now 79 nmol/L. Healthy reference range 50 to 100 nmol/L. Now within range.
You were taking 25µg of vitamin D3 with K2, added in February because you reported almost no daylight and train indoors.
Started below the reference range. Now inside it.
Ferritin
38→61µg/L
30
150
Ferritin: started at 38 µg/L, now 61 µg/L. Healthy reference range 30 to 150 µg/L. Now within range.
Iron bisglycinate at 14mg, added because you eat no red meat and train four or more times a week.
Was in range at baseline and still is.
Vitamin B12
328→341ng/L
200
700
Vitamin B12: started at 328 ng/L, now 341 ng/L. Healthy reference range 200 to 700 ng/L. Now within range.
Methylcobalamin at 25µg, part of the B complex.
This one barely moved. It was comfortably in range to begin with, so there was not much to change. We are keeping it at the same dose rather than raising it, because more would not help.
Magnesium (serum)
0.86→0.85mmol/L
0.7
1
Magnesium (serum): started at 0.86 mmol/L, now 0.85 mmol/L. Healthy reference range 0.7 to 1 mmol/L. Now within range.
Magnesium bisglycinate at 300mg, added on the strength of your answers about stress and sleep.
Your answers suggested you might be short. Your blood says otherwise, and it has not shifted in twelve weeks. We are taking it out of your formula. Your blend drops from nine ingredients to eight and your next order is £4.20 cheaper.
What changes in your formula
Every change below traces to a number above, and every one is reviewed by a registered nutritionist before it reaches your next batch.
Continue
Vitamin D3 25µg with K2
Working. Holding the dose through winter, reviewing again in spring.
Reduce
Iron bisglycinate 14mg → 9mg
Moved well. Backing off to a maintenance dose rather than a correction dose.
Hold
Methylcobalamin 25µg
In range and stable. No reason to change it.
Remove
Magnesium bisglycinate 300mg
Your blood came back fine and stayed fine. You do not need to pay for this.
Nine ingredients down to eight.
£38.60 → £34.40 per month
The number is the reason to stay
Industry writing puts most cancellations in months two and three, and Care/of closed in 2024 having raised $46m. Nothing observable happens, so people stop. A marker that moved is the only honest argument for a fourth payment.
Few markers, often, cheaply
Not a hundred biomarkers once a year. Four that your formula was built to change, retested every twelve weeks, at a cost that fits inside a subscription.
It can say no
A test that can only ever confirm the sale is marketing. This one removed an ingredient and reduced the bill. That is what makes the rest of it believable.
Blood testing is carried out by an accredited partner laboratory, which holds the clinical relationship with you and issues your result. Trace shows the trend against what you have been taking. It does not diagnose, screen for, or predict any condition, and it is not a substitute for medical advice. Speak to your GP or pharmacist about any health concern. Food supplements are not a substitute for a varied diet and a healthy lifestyle.