Source Naturals Proline & Lysine, 550 mg - 120 Tablets

Supplement facts

Ingredient	Amount per serving	% daily value
Calories	20	—
Total Carbohydrates	2 g	1%
Vitamin C	1147 mg	1,912%
Calcium	66 mg	7%
Magnesium	46 mg	12%
L-Lysine	1.1 g	—
L-Lysine Hydrochloride, Crystalline Part of L-Lysine	1374 mg	—
L-Proline	1.1 g	—
Proanthodyn	100 mg	—
Hawthorn Berry Extract	100 mg	—

2 to 4 tablets daily with meals.

Label data from the Dietary Supplement Label Database.

Label data as of 10 Sep 2026

87.2 / 100Excellent

A straightforward lysine-and-proline formula with meaningful amounts at two tablets daily; the label does not establish a specific targeted benefit.

Scoring criteria

Quantity
100 / 100
Two tablets provide about 550 mg each of lysine and proline, a meaningful supplemental amount for general use.
Form
75 / 100
Crystalline L-lysine hydrochloride and L-proline are conventional amino-acid forms with no established comparative absorption or tolerability advantage here.
Convenience
85 / 100
The directions allow 2–4 tablets daily, so I assess the smallest allowed routine: two tablets with a meal.
Label accuracy
100 / 100
The listed lysine hydrochloride amount is consistent with the declared lysine amount, and no other clear label contradiction appears.
Formula balance
75 / 100
The formula has no established balance advantage or concrete incompatibility at the assessed amounts.
Purity
75 / 100
The supplied information shows ordinary excipients but provides no product-specific evidence of enhanced purity or a documented defect.
Cofactors
50 / 100
Two tablets provide about 574 mg of vitamin C, a meaningful complementary nutrient for collagen synthesis, though added benefit for this unspecified purpose is uncertain.