NTP Supplement Safety & Efficacy 3

Question 1

A practitioner recommends 5,000 IU of vitamin D3 daily. Which co-nutrient should also be evaluated to ensure safety and proper calcium metabolism?

Accepted Answer

Vitamin K2

Answer

High-dose vitamin D3 increases calcium absorption, and vitamin K2 (MK-7) is needed to direct calcium into bones rather than soft tissues and arteries.

Question 2

Which supplement has demonstrated evidence of nephrotoxicity (kidney damage) when consumed chronically at high doses?

Accepted Answer

Aristolochic acid (found in some herbal supplements)

Answer

Aristolochic acid, found in some traditional herbal preparations, is a potent nephrotoxin causing progressive renal fibrosis and urothelial carcinoma.

Question 3

When is the optimal time to take iron supplements to maximize absorption?

Accepted Answer

On an empty stomach or with vitamin C, away from calcium and coffee

Answer

Iron is best absorbed in an acidic environment on an empty stomach; vitamin C enhances non-heme iron absorption, while calcium, fiber, and tannins inhibit it.

Question 4

A client reports taking 2,000 mg/day of niacin (nicotinic acid) for cholesterol management. Which adverse effect requires immediate evaluation?

Accepted Answer

Elevated liver enzymes and hepatotoxicity

Answer

High-dose niacin (2,000+ mg/day) is associated with hepatotoxicity, especially with sustained-release forms; liver function tests should be monitored regularly.

Question 5

Which supplement form is LEAST bioavailable and most likely to cause GI distress?

Accepted Answer

Magnesium oxide

Answer

Magnesium oxide has very low bioavailability (~4%) due to poor solubility and is poorly absorbed, often causing osmotic diarrhea at therapeutic doses.

(NTP) Nutritional Therapy Practitioner Practice Test

(NTP) Nutritional Therapy Practitioner Practice Test

NTP Supplement Safety & Efficacy 3