This narrative review covers how the body handles vitamins A, D, E and K, who tends to run low, and how clinicians identify and treat a shortfall. It draws on human studies published in the previous five years plus older reference material. The authors conclude that a varied diet covers most people, that supplements are for confirmed deficiency, and that taking too much of these vitamins can cause harm.
Vitamins A, D, E and K are fat-soluble, meaning the body absorbs them along with dietary fat. Intake is almost entirely from food, apart from vitamin D, which the skin also makes when exposed to ultraviolet B light. The authors are internal medicine doctors in Strasbourg and Madrid. They argue that shortfalls in these four vitamins are often missed in ordinary practice, because clinicians do not always recognize the clinical picture or the underlying cause. They gathered recent literature into one reference covering what these vitamins do, what a deficiency looks like, what causes one, and how it is diagnosed and treated.
This is a narrative review, not a trial. Nobody was given anything and no outcomes were measured. The authors searched PubMed through Medline with a five year time limit, restricted to human studies in English and French, using terms including "fat-soluble vitamin deficiency", "clinical manifestations", "etiology" and "treatment". They also screened reference lists via Google Scholar and drew on older papers, textbooks and reports from academic societies. Studies were chosen by the authors, with no formal quality scoring and no pooling of results.
Recommended adult intakes reported are:
The review cites World Health Organization figures of around 250 million vitamin A deficient children worldwide. Treatment regimens for diagnosed deficiency are 100,000 IU per day of vitamin A for 3 days then 50,000 IU per day for 2 weeks; cholecalciferol at 3000 to 10,000 IU per day, averaging 5000, for 1 to 2 months, or a loading dose of 60,000 to 150,000 IU then 2000 IU per day; and vitamin E at 50 to 2000 IU per day. Vitamin K treatment is limited to newborns and to reversing anticoagulant overdose.
This is a narrative review with no pre-registered protocol, no risk-of-bias assessment and no statistical pooling, so it carries less weight than a systematic review. The authors state plainly that the treatment regimens they list are mostly based on studies that do not meet evidence-based medicine criteria. They note that few solid data exist from industrialized countries, particularly for vitamins E and K. On vitamin D and disease risk they say the evidence is largely epidemiological, that association does not imply cause, and that most prevention trials have been inconclusive. The paper reports no external funding and the authors declare no conflicts of interest.
This is a clinical reference about deficiency states, written for doctors. Those at risk include newborns, growing children, pregnant and breastfeeding women, older and isolated people, and patients with digestive disease, liver disease or chronic illness. The doses listed are curative doses for a diagnosed deficiency under medical supervision, and that does not automatically extend to healthy or younger people. The review does not show that well nourished people gain anything from taking more of these vitamins. It warns about the opposite risk: hypervitaminosis from long-term high doses and hidden sources, and over-testing for vitamin D in routine care.
That depends on the specific medication and formula. A few, like blood thinners with CurQLife or blood pressure medication with MaxiNOs, are worth a direct conversation with your doctor first. Check each formula's own FAQ section for specifics, or ask your health coach.
No, and we'd rather be upfront about it. Bacopa, the plant in BacoZest, has published human studies, though they used other bacopa extracts. OptiNOs and MaxiNOs each have human studies sponsored by their maker, Laila Nutraceuticals, which haven't been published in a journal. CurQLife's research is still early, from lab and animal studies, and we label it that way.
It depends on what you're building your routine around. BacoZest is built around bacopa, which is studied for memory.* OptiNOs supports strength and muscular endurance alongside resistance training.* MaxiNOs was studied for healthy blood vessel function.* CurQLife's research is still at the lab stage. Your health coach can help you pick a starting point.
All four are built around plant extracts. OptiNOs was reported as well tolerated in its human study, and published bacopa studies reported no serious side effects. CurQLife's safety data so far comes from lab and animal testing. Check with your doctor first if you're pregnant, nursing, on medication, or managing a health condition.
Because the patented ingredients behind our four formulas went through dedicated research, and research costs real money. A generic curcumin or bacopa supplement hasn't been tested in the form you get from us. You're paying for an ingredient with research behind it, not just a label.
Generic ingredients often haven't been studied in the specific form you're buying. Our four core formulas use patented ingredients, and we show you the research behind each one, including where it's still early.
It depends on the formula. In its study, MaxiNOs blood vessel response was higher than placebo 2 to 3 hours after the first dose.* OptiNOs and bacopa were studied over 6 and 12 weeks of daily use, so give them time. CurQLife is meant to be taken daily.
Yes. BacoZest, OptiNOs, MaxiNOs, and CurQLife are built for different goals, and none of them contain stimulants. They haven't been studied together, so ask your health coach how to fit them into your routine.
