A non-therapeutic method for providing nutritional supplements for a subject, said method including a sequence of the following steps in given order: A) taking a sample of at least one of blood, blood serum, blood plasma, from the subject; B) analyzing said sample to determine the nutritional status of the subject; C) based on the results of step B) calculation of the required nutritional advice and/or nutritional supplements in the form of a recommendation vector (d) to improve the nutritional status of the subject; D) providing individualized nutritional supplement advice and/or individualized nutritional supplements to the subject on the basis of the recommendation vector (d); repeating the sequence of A)-D) after a time span of at least two days for adapting the provided nutritional advice and/or nutritional supplements in step D) of the second sequence based on the development of the subject at least in the time interval between the sequences, wherein the sequences A)-D) are carried out at regular intervals over an extended time span of at least 3 months, preferably of at least 6 months, with carrying out the sequence at least every month, wherein the frequency of carrying out the sequences can be determined by the results of the analysis in B) and the calculation in C), and wherein the step D) includes information provided to the subject when the next sample needs to be taken, and either continuing at the same frequency or reducing the frequency after having reached a steady-state situation, wherein the first cycle step C) involves the prediction of at least one initial absorption characteristics matrix (A k, B p(k), C k, D p(k)), and the multiplication of this at least one initial absorption characteristics matrix (A k, B p(k), C k, D p(k)), weighted with weighting factors (α, β, γ, δ), with an initial recommendation vector (d 1) for the calculation of a target profile vector (x 1 †) after a given first nutritionally supplemented time interval from the profile vector (x 0) as determined in step B), and wherein in each following cycle adaptation is implemented in that the difference between the previously calculated target profile vector (x n †) and the profile vector (x n) as determined in the actual analysis step B) is minimized by adapting and thereby personalizing at least one of the initial absorption characteristics matrix (A k, B p(k), C k, D p(k)) and the weighting factors (α, β), and using the adapted absorption characteristics matrix (A k, B p(k), C k, D p(k)) and weighting factors (α, β, γ, δ) for the calculation of the required next recommendation vector (d n+1) and for the prediction of the next target profile vector (x n+1 †) after a given next nutritionally supplemented time interval, wherein the dimensionality of the recommendation vector (d) and the target profile vector (x n †) is at least 4. A) taking a sample of at least one of blood, blood serum, blood plasma, from the subject; B) analyzing said sample to determine the nutritional status of the subject; C) based on the results of step B) calculation of the required nutritional advice and/or nutritional supplements in the form of a recommendation vector (d) to improve the nutritional status of the subject; D) providing individualized nutritional supplement advice and/or individualized nutritional supplements to the subject on the basis of the recommendation vector (d);