## Step 1: Define the optimization problem
The goal is to maximize the objective function: $2.99 \times \text{milligrams of magnesium} + 9.81 \times \text{milligrams of vitamin B7} + 2.56 \times \text{milligrams of vitamin B4} + 7.53 \times \text{milligrams of vitamin B3}$.

## Step 2: List all the constraints
The constraints are as follows:
- Kidney support index for magnesium: $22$
- Digestive support index for magnesium: $7$
- Immune support index for magnesium: $14$
- Kidney support index for vitamin B7: $10$
- Digestive support index for vitamin B7: $5$
- Immune support index for vitamin B7: $23$
- Kidney support index for vitamin B4: $2$
- Digestive support index for vitamin B4: $25$
- Immune support index for vitamin B4: $25$
- Kidney support index for vitamin B3: $3$
- Digestive support index for vitamin B3: $6$
- Immune support index for vitamin B3: $18$
- Total digestive support index from magnesium and vitamin B4: $\geq 11$
- Total immune support index from vitamin B4 and vitamin B3: $\geq 22$
- Total immune support index from vitamin B7 and vitamin B3: $\geq 36$
- Total immune support index from magnesium and vitamin B4: $\geq 50$
- Total immune support index from magnesium, vitamin B7, and vitamin B4: $\geq 61$
- Total immune support index from magnesium, vitamin B4, and vitamin B3: $\geq 45$
- Total immune support index from magnesium, vitamin B7, and vitamin B4: $\geq 45$
- Total kidney support index from vitamin B7 and vitamin B4: $\leq 119$
- Total kidney support index from magnesium and vitamin B4: $\leq 101$
- Total kidney support index from magnesium and vitamin B3: $\leq 120$
- Total kidney support index from all: $\leq 120$
- Total digestive support index from magnesium and vitamin B7: $\leq 94$
- Total digestive support index from vitamin B7 and vitamin B4: $\leq 108$
- Total digestive support index from magnesium and vitamin B3: $\leq 106$
- Total digestive support index from vitamin B7 and vitamin B3: $\leq 74$
- Total digestive support index from magnesium and vitamin B4: $\leq 136$
- Total digestive support index from vitamin B4 and vitamin B3: $\leq 40$
- Total digestive support index from all: $\leq 40$
- Total immune support index from vitamin B7 and vitamin B3: $\leq 83$
- Total immune support index from magnesium and vitamin B4: $\leq 172$
- Total immune support index from magnesium and vitamin B7: $\leq 182$
- Total immune support index from magnesium and vitamin B3: $\leq 73$
- Total immune support index from all: $\leq 73$

## 3: Formulate the problem in Gurobi
We will use Gurobi to solve this linear programming problem.

```python
import gurobi as gp

# Create a new model
m = gp.Model("optimization_problem")

# Define the variables
magnesium = m.addVar(name="magnesium", lb=0)  # Non-negative
vitamin_B7 = m.addVar(name="vitamin_B7", lb=0)  # Non-negative
vitamin_B4 = m.addVar(name="vitamin_B4", lb=0)  # Non-negative
vitamin_B3 = m.addVar(name="vitamin_B3", lb=0)  # Non-negative

# Objective function
m.setObjective(2.99 * magnesium + 9.81 * vitamin_B7 + 2.56 * vitamin_B4 + 7.53 * vitamin_B3, gp.GRB.MAXIMIZE)

# Constraints
# Individual support indices
m.addConstr(magnesium * 22 + vitamin_B7 * 10 + vitamin_B4 * 2 + vitamin_B3 * 3 <= 121, "kidney_support")
m.addConstr(magnesium * 7 + vitamin_B7 * 5 + vitamin_B4 * 25 + vitamin_B3 * 6 <= 139, "digestive_support")
m.addConstr(magnesium * 14 + vitamin_B7 * 23 + vitamin_B4 * 25 + vitamin_B3 * 18 <= 263, "immune_support")

# Combined support indices
m.addConstr(magnesium * 7 + vitamin_B4 * 25 >= 11, "min_digestive_magnesium_B4")
m.addConstr(vitamin_B4 * 25 + vitamin_B3 * 18 >= 22, "min_immune_B4_B3")
m.addConstr(vitamin_B7 * 23 + vitamin_B3 * 18 >= 36, "min_immune_B7_B3")
m.addConstr(magnesium * 14 + vitamin_B4 * 25 >= 50, "min_immune_magnesium_B4")
m.addConstr(magnesium * 14 + vitamin_B7 * 23 + vitamin_B4 * 25 >= 61, "min_immune_magnesium_B7_B4")
m.addConstr(magnesium * 14 + vitamin_B4 * 25 + vitamin_B3 * 18 >= 61, "min_immune_magnesium_B4_B3")
m.addConstr(magnesium * 14 + vitamin_B4 * 25 + vitamin_B3 * 18 >= 45, "min_immune_magnesium_B4_B3_2")
m.addConstr(magnesium * 14 + vitamin_B7 * 23 + vitamin_B4 * 25 >= 45, "min_immune_magnesium_B7_B4_2")

# Kidney support indices
m.addConstr(vitamin_B7 * 10 + vitamin_B4 * 2 <= 119, "max_kidney_B7_B4")
m.addConstr(magnesium * 22 + vitamin_B4 * 2 <= 101, "max_kidney_magnesium_B4")
m.addConstr(magnesium * 22 + vitamin_B3 * 3 <= 120, "max_kidney_magnesium_B3")
m.addConstr(magnesium * 22 + vitamin_B7 * 10 + vitamin_B4 * 2 + vitamin_B3 * 3 <= 120, "max_kidney_all")

# Digestive support indices
m.addConstr(magnesium * 7 + vitamin_B7 * 5 <= 94, "max_digestive_magnesium_B7")
m.addConstr(vitamin_B7 * 5 + vitamin_B4 * 25 <= 108, "max_digestive_B7_B4")
m.addConstr(magnesium * 7 + vitamin_B3 * 6 <= 106, "max_digestive_magnesium_B3")
m.addConstr(vitamin_B7 * 5 + vitamin_B3 * 6 <= 74, "max_digestive_B7_B3")
m.addConstr(magnesium * 7 + vitamin_B4 * 25 <= 136, "max_digestive_magnesium_B4")
m.addConstr(vitamin_B4 * 25 + vitamin_B3 * 6 <= 40, "max_digestive_B4_B3")
m.addConstr(magnesium * 7 + vitamin_B7 * 5 + vitamin_B4 * 25 + vitamin_B3 * 6 <= 40, "max_digestive_all")

# Immune support indices
m.addConstr(vitamin_B7 * 23 + vitamin_B3 * 18 <= 83, "max_immune_B7_B3")
m.addConstr(magnesium * 14 + vitamin_B4 * 25 <= 172, "max_immune_magnesium_B4")
m.addConstr(magnesium * 14 + vitamin_B7 * 23 <= 182, "max_immune_magnesium_B7")
m.addConstr(magnesium * 14 + vitamin_B3 * 18 <= 73, "max_immune_magnesium_B3")
m.addConstr(magnesium * 14 + vitamin_B7 * 23 + vitamin_B4 * 25 + vitamin_B3 * 18 <= 73, "max_immune_all")

# Solve the model
m.optimize()

# Print the solution
if m.status == gp.GRB.OPTIMAL:
    print("Optimal solution found.")
    print(f"Magnesium: {magnesium.varValue}")
    print(f"Vitamin B7: {vitamin_B7.varValue}")
    print(f"Vitamin B4: {vitamin_B4.varValue}")
    print(f"Vitamin B3: {vitamin_B3.varValue}")
    print(f"Objective: {m.objVal}")
else:
    print("No optimal solution found.")
```