SPLIT ACROSS WINDOWS
Bones & joints
That formula carries 800 mg of calcium. Our iron monograph records that 300 mg of calcium or more cuts the iron you absorb by around half, and the timing rule written for this formula keeps the two apart: iron in the morning, before food, and Bones & joints at night, so they never share a pour. This one is not from the ingredient-pair table: calcium and iron are not a documented pair in it yet. It comes from the formula's own timing rule and from that monograph.
KEPT APART
Caffeine, curcumin & high-dose vitamin C
Caffeine cuts iron absorption, so Cognitive & focus, Acute energy and Pre-workout are served at least 1 hour away from this one. The curcumin in Systemic inflammation, Muscle damage (CK) and Anti-inflammatory & recovery binds iron, and so does the milk thistle in Liver (ALT / AST): those are kept at least 2 hours away, and all four go out at night anyway. Acute immunity and Cold symptom support carry 1,000 mg of vitamin C, which may break down B12, so they are served at least 2 hours apart as well.
TALK TO A DOCTOR FIRST
Not for everyone
Ruled out if you have hereditary haemochromatosis or any other iron overload, thalassaemia or another iron-loading anaemia, sideroblastic anaemia or porphyria cutanea tarda; if you have liver disease, including active chronic hepatitis; if you have an active bacterial infection; or if you take a vitamin K antagonist such as warfarin or acenocoumarol. Stop it and see a doctor if you notice yellowing skin or eyes, unusual tiredness, abdominal pain or dark urine. Pregnancy and breastfeeding do not rule it out, but iron only goes out on a confirmed deficiency or your obstetrician's advice. Talk to a doctor first if you are under 18, where the upper limit for iron is lower (40 mg); have kidney disease or kidney stones, G6PD deficiency, polycythaemia vera, Leber's optic atrophy or a cobalt allergy; or have cancer or are in cancer treatment. The same if you take other anticoagulants (apixaban, dabigatran), levothyroxine (at least 4 hours apart), quinolone antibiotics such as ciprofloxacin (2 hours before or 6 hours after), tetracyclines, levodopa, captopril or penicillamine (at least 2 hours apart, and our file gives captopril a window of 2 to 4 hours), antacids with calcium, magnesium or aluminium (at least 2 hours apart; with the aluminium ones, the vitamin C in this formula can also raise how much aluminium you absorb, which matters if you have kidney disease), bisphosphonates (at least 30 minutes apart), methyldopa, proton pump inhibitors or H2 blockers (at least 2 hours apart), allopurinol, chloramphenicol, deferoxamine, colchicine, statins with niacin or the contraceptive pill, or if you have had repeated nitrous oxide anaesthesia. On metformin or a proton pump inhibitor long term, tell your doctor: both can lower your B12. An overdose of iron is dangerous to children, so keep the cartridge out of their reach. The app asks before it ever assigns this one.