## Step 1: Define the optimization problem
The problem is to maximize the objective function: $2x_0 + 1x_1 + 6x_2$, where $x_0$ represents the milligrams of vitamin E, $x_1$ represents the milligrams of magnesium, and $x_2$ represents the milligrams of vitamin A.

## Step 2: List all the constraints
The constraints are as follows:
- $13x_0 + 10x_1 + 1x_2 \geq 29$ (kidney support index)
- $10x_0 + 22x_1 \geq 52$ (energy stability index for vitamin E and magnesium)
- $10x_0 + 4x_2 \geq 40$ (energy stability index for vitamin E and vitamin A)
- $17x_1 + 2x_2 \geq 31$ (digestive support index for magnesium and vitamin A)
- $4x_1 + 17x_2 \geq 42$ (muscle growth index for magnesium and vitamin A)
- $8x_0 + 17x_2 \geq 16$ (muscle growth index for vitamin E and vitamin A)
- $13x_0 + 10x_1 + 1x_2 \leq 99$ (kidney support index upper bound for vitamin E and magnesium)
- $13x_0 + 1x_2 \leq 104$ (kidney support index upper bound for vitamin E and vitamin A)
- $13x_0 + 10x_1 + 1x_2 \leq 161$ (kidney support index upper bound for all)
- $10x_0 + 22x_1 + 4x_2 \leq 130$ (energy stability index upper bound for all)
- $10x_0 + 4x_2 \leq 130$ (energy stability index upper bound for vitamin E and vitamin A)
- $22x_1 + 4x_2 \leq 130$ (energy stability index upper bound for magnesium and vitamin A)
- $5x_0 + 17x_1 + 2x_2 \leq 72$ (digestive support index upper bound for vitamin E and magnesium and vitamin A, corrected to reflect proper indices)
- $5x_0 + 2x_2 \leq 72$ (digestive support index upper bound for vitamin E and vitamin A)
- $17x_1 + 2x_2 \leq 73$ (digestive support index upper bound for magnesium and vitamin A)
- $5x_0 + 17x_1 + 2x_2 \leq 73$ (digestive support index upper bound for all)
- $7x_0 + 20x_1 + 5x_2 \leq 183$ (cognitive performance index upper bound for magnesium and vitamin A)
- $7x_0 + 20x_1 + 5x_2 \leq 151$ (cognitive performance index upper bound for all)
- $8x_0 + 4x_1 + 17x_2 \leq 127$ (muscle growth index upper bound for vitamin E and vitamin A)
- $8x_0 + 4x_1 \leq 51$ (muscle growth index upper bound for vitamin E and magnesium)
- $4x_1 + 17x_2 \leq 106$ (muscle growth index upper bound for magnesium and vitamin A)
- $8x_0 + 4x_1 + 17x_2 \leq 106$ (muscle growth index upper bound for all)

## Step 3: Implement the optimization problem using Gurobi
We will use the Gurobi Python library to model and solve this optimization problem.

```python
import gurobi

def optimize():
    # Create a new model
    model = gurobi.Model()

    # Define the variables
    x0 = model.addVar(lb=0, name="milligrams of vitamin E", vtype=gurobi.GRB.CONTINUOUS)
    x1 = model.addVar(lb=0, name="milligrams of magnesium", vtype=gurobi.GRB.CONTINUOUS)
    x2 = model.addVar(lb=0, name="milligrams of vitamin A", vtype=gurobi.GRB.CONTINUOUS)

    # Define the objective function
    model.setObjective(2*x0 + x1 + 6*x2, gurobi.GRB.MAXIMIZE)

    # Add constraints
    model.addConstr(13*x0 + 10*x1 + x2 >= 29, name="kidney_support_index")
    model.addConstr(10*x0 + 22*x1 >= 52, name="energy_stability_index_vitamin_e_magnesium")
    model.addConstr(10*x0 + 4*x2 >= 40, name="energy_stability_index_vitamin_e_vitamin_a")
    model.addConstr(17*x1 + 2*x2 >= 31, name="digestive_support_index_magnesium_vitamin_a")
    model.addConstr(4*x1 + 17*x2 >= 42, name="muscle_growth_index_magnesium_vitamin_a")
    model.addConstr(8*x0 + 17*x2 >= 16, name="muscle_growth_index_vitamin_e_vitamin_a")

    model.addConstr(13*x0 + 10*x1 + x2 <= 99, name="kidney_support_index_upper_bound_vitamin_e_magnesium")
    model.addConstr(13*x0 + x2 <= 104, name="kidney_support_index_upper_bound_vitamin_e_vitamin_a")
    model.addConstr(13*x0 + 10*x1 + x2 <= 161, name="kidney_support_index_upper_bound_all")
    model.addConstr(10*x0 + 22*x1 + 4*x2 <= 130, name="energy_stability_index_upper_bound_all")
    model.addConstr(10*x0 + 4*x2 <= 130, name="energy_stability_index_upper_bound_vitamin_e_vitamin_a")
    model.addConstr(22*x1 + 4*x2 <= 130, name="energy_stability_index_upper_bound_magnesium_vitamin_a")

    model.addConstr(5*x0 + 17*x1 + 2*x2 <= 73, name="digestive_support_index_upper_bound_all")
    model.addConstr(5*x0 + 2*x2 <= 72, name="digestive_support_index_upper_bound_vitamin_e_vitamin_a")
    model.addConstr(17*x1 + 2*x2 <= 73, name="digestive_support_index_upper_bound_magnesium_vitamin_a")

    model.addConstr(7*x0 + 20*x1 + 5*x2 <= 151, name="cognitive_performance_index_upper_bound_all")
    model.addConstr(7*x0 + 20*x1 + 5*x2 <= 183, name="cognitive_performance_index_upper_bound_magnesium_vitamin_a")

    model.addConstr(8*x0 + 4*x1 + 17*x2 <= 106, name="muscle_growth_index_upper_bound_all")
    model.addConstr(8*x0 + 4*x1 <= 51, name="muscle_growth_index_upper_bound_vitamin_e_magnesium")
    model.addConstr(4*x1 + 17*x2 <= 106, name="muscle_growth_index_upper_bound_magnesium_vitamin_a")
    model.addConstr(8*x0 + 17*x2 <= 127, name="muscle_growth_index_upper_bound_vitamin_e_vitamin_a")

    # Solve the model
    model.optimize()

    # Print the solution
    if model.status == gurobi.GRB.OPTIMAL:
        print("Optimal solution found.")
        print(f"Milligrams of vitamin E: {x0.varValue}")
        print(f"Milligrams of magnesium: {x1.varValue}")
        print(f"Milligrams of vitamin A: {x2.varValue}")
        print(f"Objective function value: {model.objVal}")
    else:
        print("No optimal solution found.")

optimize()
```