Most people who take vitamin supplements take them all at once, usually at the end of the day after their last meal.
Other than the risk of overloading your digestive tract and most of them being passed instead of used, this isn’t a bad strategy… especially if your vitamins are fat-soluble and you’ve had a large, fairly-fat-rich meal for dinner. Sure, some will likely get passed, but much of what doesn’t directly go to your bloodstream for use could them get stored in whatever fat you end up storing, to be released in your bloodstream later when that fat is tapped for energy. (This in fact is why vitamin capsules contain oils: The oils are digested and stored as fat, and the vitamins absorbed can come along for the ride.)
This is beneficial for runners, triathletes and other endurance athletes. When they go to train soon thereafter, any of that fat that’s aerobically burned will also release those stored vitamins for use… at a time when their body may actually need it.
Now, that said, while I’ve talked about vitamins that can and should go together (like Vitamin K2 and calcium), some nutrients don’t go with other nutrients. And one key nutrient to keep in mind is L-theanine.
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