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Spacing out supplements and vitamins Are there health benefits to spacing out when you …

what it claims

The community suggests that it is preferable to space out the intake of dietary supplements throughout the day rather than taking them all at once, as some substances compete for absorption while others require specific conditions (presence of lipids or partner vitamins) to be properly assimilated.

holds up

Science confirms that nutrient interactions exist: for example, iron and calcium compete during intestinal absorption (observational studies and RCTs on mineral absorption).

noli's read

Science confirms that nutrient interactions exist: for example, iron and calcium compete during intestinal absorption (observational studies and RCTs on mineral absorption). It is well established that fat-soluble vitamins (A, D, E, K) require dietary fats for optimal absorption, a fact supported by nutrition research. The idea of pairing vitamin C with iron to improve its absorption is also validated by numerous clinical studies. Conversely, certain claims in the thread, such as the absolute prohibition of consuming coffee or tea within 3 hours of any intake, or systematic adjustment based on the hormonal cycle, stem more from extrapolation than from a proven, generalized necessity for the general public. The community strongly converges on the idea that the context of intake (meals, combinations) is crucial, while recognizing that regularity (not forgetting to take them) remains the most practical factor for success.

the sources

Claimed by r/nutrition. Noli grades the claim, never the person.

Decoded by Noli · July 18, 2026 · the original post

What the graded evidence says

Linked to, not proven to cause.

Measured on: general principle

r/nutrition in the Register34 claims graded · solidity 86/100See their record →

More from r/nutrition

Fortified soy milk serves as a nutritionally equivalent, or even superior, alternative to cow's milk, offering a comparable protein and micronutrient profile while being better tolerated by the body.

holds upr/nutrition

The community considers that adding butter to coffee, often associated with the ketogenic diet, provides no intrinsic nutritional benefit and serves primarily to increase fat intake or suppress appetite, while noting a potential risk related to excessive saturated fat.

overstatedr/nutrition

The community suggests that water is the optimal beverage, closely followed by green tea (or matcha) and black coffee, as natural options to support overall health without added sugar.

holds upr/nutrition

Others on this

The buzz from a Monster Energy comes almost entirely from its caffeine (and the sugar riding along with it) — the taurine and the B-vitamin megadoses on the can don't add a proven benefit beyond that.

mixedscience.snitch

Extreme, prolonged sun deprivation — like months aboard a nuclear submarine — is exactly the scenario where routine vitamin D supplementation makes real sense: several studies on submarine crews (Royal Navy, US Navy) show levels drop markedly within weeks without it.

holds upPaul McNally

For women in their 20s: four basics are enough — omega-3, vitamin D3, magnesium glycinate, and a quality probiotic — rather than 15 supplements.

mixedThebiohackingrn

Noli has read similar claims

Other advice in the Register that leans on the same research.

Sardines are an affordable superfood offering an excellent protein-to-omega-3 ratio, low heavy metal contamination, and better nutrient bioavailability than dietary supplements.

holds upJimmy Mohamed

Before buying another supplement, audit what you're already taking — most well-fed adults are already covered, and the real question isn't which one to buy but whether you actually have a shortfall worth correcting.

mixedRevant Himatsingka

Dr. Idz questions the simplistic dichotomy between "Big Pharma" and "Big Supplement," suggesting that both sectors can influence health narratives in biased ways and that consumers must remain vigilant regarding the marketing behind both industries.

holds upDr Idrees Mughal (MBBS, MRes, DipIBLM)

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