. L-Theanine

• Common Side Effects:
  • Drowsiness (in some individuals)
  • Lowered blood pressure
• Notes: Generally well-tolerated, but monitor for any unusual reactions, especially if combined with other medications.

3. Rhodiola Rosea

• Common Side Effects:
  • Dry mouth
  • Dizziness
  • Upset stomach
  • Fatigue (in some cases)
• Notes: It may also cause overstimulation if taken in high doses, leading to insomnia.

4. Acetyl-L-Carnitine (ALCAR)

• Common Side Effects:
  • Nausea
  • Gastrointestinal discomfort
  • Headaches
  • Increased agitation or anxiety (in some individuals)
• Notes: ALCAR may have a stimulating effect, so take it earlier in the day.

5. Alpha-GPC

• Common Side Effects:
  • Headaches
  • Fatigue
  • Digestive issues (nausea or diarrhea)
• Notes: Generally well-tolerated but can cause side effects when taken in high doses.

6. Creatine

• Common Side Effects:
  • Weight gain (due to water retention)
  • Gastrointestinal distress (cramps, diarrhea)
  • Muscle cramping
• Notes: Creatine is generally safe for most people, but it’s essential to stay hydrated while using it.

7. B-Vitamins

• Common Side Effects (varies by specific vitamin):
  • B1 (Thiamine): Rarely causes side effects; high doses can cause allergic reactions.
  • B2 (Riboflavin): Generally safe; high doses can cause bright yellow urine.
  • B3 (Niacin): Flushing, itching, or burning of the skin (especially in high doses).
  • B5 (Pantothenic Acid): Rarely causes side effects; high doses may cause diarrhea.
  • B6 (Pyridoxine): High doses over long periods can cause nerve damage.
  • B12 (Cobalamin): Generally safe; high doses may cause rare allergic reactions.
  • Folate (B9): High doses can mask B12 deficiency symptoms.